Ricardo Siqueira da Silva

Universidade Federal dos Vales do Jequitinhonha e Mucuri | UFVJM · Departamento de Agronomia

At the global level, Sorghum bicolor (L.), is one of the most important crops, which ranks fifth among all cereals. It is cultivated in Africa, Asia, Oceania and the Americas, where it serves as a source of food and feed for humans and animals, respectively. However, production is constrained by several factors including pests and diseases. Among t...

Erthesina fullo (Thunberg) (Hemiptera: Pentatomidae) is an invasive pest that has recently been detected in Europe (2017) and South America (2021). Due to polyphagia and temperature adaptation, this pest has a high risk of establishing in introduced areas. However, despite recent invasion events, there are no data on potentially suitable areas for...

The Caribbean fruit fly, Anastrepha suspensa (Lower, 1862) (Diptera: Tephritidae), is a pest of significant economic importance in Central America and Florida (USA). This study was carried out to examine the influence of climate change on the space-time distribution of A. suspensa on temporal and spatial scales. The CLIMEX software was used to mode...

Podisus nigrispinus (Dallas) (Hemiptera: Pentatomidae) and Palmistichus elaeisis (Delvare & LaSalle) (Hymenoptera: Eulophidae) are commercially used in the biological control of defoliating lepidopterans in Brazil. The combination of these natural enemies in integrated pest management systems and the risks of intraguild interactions in simultaneous...

In economic terms, invasive species pose risks to human interests in management systems related to agriculture, animal health, and forestry, as they cause damage and change the composition of native species. Through modeling, ecological studies can help identify favorable climatic environments for species. Using biological factors and climate data,...

The mango weevil, Sternochetus mangiferae (Fabricius) (Curculionidae), pest present in Brazil and is restricted to some municipalities in the Rio de Janeiro State. This curculionid attacks the mango crop exclusively and puts mango production globally at risk, especially those destined for export. Using ecological modeling tools, this study is the f...

Land classification offers decision-makers a baseline to act assertively, improving the relationship between production and the conservation of natural resources. This work characterises the potential of land use concerning agrosilvopastoral use, soil conservation, and water production through a proof of concept to support landscape planning at the...

Striga asiatica (dicot), an obligate hemiparasitic of monocots, is a potential threat to South America. Determining the ecological factors that explain the occurrence and predicting suitable areas for S. asiatica are fundamental for designing prevention strategies. We developed a Spatio-temporal dynamics model and evaluated Brazil's Weekly Growth I...

Background: Corn is one of the main crops grown globally to produce food for human consumption and animal feed, including raw materials for bioenergy. Effective pest management is critical for the economic viability of corn production. The leafhopper Dalbulus maidis and the diseases transmitted by it has become relevant to corn production. Our stu...

The phloem-limited bacteria, “Candidatus Liberibacter asiaticus” and “Ca. L. americanus”, are the causal pathogens responsible for Huanglongbing (HLB). The Asian citrus psyllid Diaphorina citri Kuwayama (Hemiptera: Liviidae) is the principal vector of these “Ca. Liberibacter” species. Though Tamarixia radiata Waterston (Hymenoptera: Eulophidae) has...

The Asian citrus psyllid (ACP), Diaphorina citri Kuwayama (Hemiptera: Liviidae), is an efficient vector of “Candidatus Liberibacter” species, the causative agents implicated in citrus greening or huanglongbing (HLB). HLB is the most devastating citrus disease and has killed hundreds of millions of citrus trees worldwide. Classical biological contro...

The impact of invasive alien pests on agriculture, food security, and biodiversity conservation has been worsened by climate change caused by the rising earth’s atmospheric greenhouse gases. The African citrus triozid, Trioza erytreae (Del Guercio; Hemiptera: Triozidae), is an invasive pest of all citrus species. It vectors the phloem-limited bacte...

There is currently a lack of information in the literature on the integrated production of macauba (Acrocomia aculeata) and soybean (Glycine max) crops, and the importance of expanding integrated production systems; therefore, the objective of this work was to identify the effects of macauba shading on growth, development, and productivity of diffe...

Schizotetranychus hindustanicus Hirst (Acari: Tetranychidae) known as the Hindustan citrus mite, is a quarantine pest present in Roraima, Brazil. In 1924 this pest was described in India. It was reported in 2002 in Venezuela and in Roraima in 2008. In 2010, the Hindustan citrus mite was reported in Colombia. It is possible that it will be introduce...

The relationship between herbivorous insects and plants is an example of an ‘evolutionary arms race’. Understanding the relationship between insects and their host plants makes it possible to determine critical points in the bioecology of these herbivores. In this relationship, insects and plants use strategies to overcome, avoid and mitigate the a...

Sustainable wood production is one of the current challenges due to the increasing demand for wood worldwide. Despite, forest planting has proved to be a good solution; the high wood productivity can be achieved only under favorable bioclimatic conditions, which makes this study of great value for government policies. This study aimed to assess the...

Predatory mites belonging to the family Phytoseiidae are the main agents used globally for the biological control of pest mites, especially predators of the genus Neoseiulus, particularly Neoseiulus californicus (McGregor) and Neoseiulus idaeus (Denmark & Muma). A major target is the ubiquitous mite Tetranychus urticae (Koch). A major factor limiti...

The nutrient stress hypothesis predicts that galling insects prevail on host plants growing in habitats with soils of low nutritional quality. Caryocar brasiliense (Caryocaraceae) is host to four different leaf-galling insects. These insects have the potential to cause a reduction in the production of C. brasiliense fruits, an important source of i...

The African citrus triozid (ACT) Trioza erytreae (Del Guercio) (Hemiptera: Triozidae), is a principal vector of “Candidatus Liberibacter species”, the pathogens implicated in citrus greening disease, infecting millions of citrus trees annually. Unfortunately, present control measures are insufficient, necessitating the development of novel climate-...

This study aimed to identify the global risk of invasion and establishment of Bedellia somnulentella, a pest of the sweet potato crop, for the present and future time, to develop policies and prevent future outbreaks. Current climate projections and future (2030, 2050, 2070, and 2100) of the insect B. somnulentella were carried out using CLIMEX. Th...

Urochloapanicoides P. Beauv. is considered one of the most harmful weeds in the United States and Australia. It is invasive in Pakistan, Mexico, and Brazil, but its occurrence is hardly reported in China and European countries. Species distribution models enable the measurement of the impact of climate change on plant growth, allowing for risk anal...

Forest restoration is mainly based on plant-soil relationships and plant species with economic potential, but those between insects and other arthropods are also important to this reestablishment. The objective was to evaluate, during 24 months, the relationships between tending ants, Hemiptera phytophagous, predators and their distribution pattern...

Striga asiatica (Lamiales: Orobanchaceae), a hemi-parasitic plant native to sub-Saharan Africa and tropical Asia, is particularly problematic to rice, corn, and sorghum cultivation in Africa. Striga asiatica produces a large number of small sized (<0.5 mm) seeds, thereby facilitating easy dispersion by commercial exchange of contaminated grains. Th...

The invasive exotic plant Melinis minutiflora P.Beauv. is a globally invasive species and impacts the economy, biodiversity, and human well-being. The challenges of biological invasion may be intensified by climate change. The increase in temperatures and concentrations of greenhouse gases may favor the introduction, establishment, and expansion po...

Índices de retenção e evasão nos cursos da Faculdade de Ciências Agrárias da Universidade Federal dos Vales do Jequitinhonha e Mucuri em 2018 e 2019.

Galling insects are abundant in nature, found in many ecosystems globally, with species attacking plants of economic importance. We studied the effects of free-feeding organisms on the abundance of galling insects on Caryocar brasiliense (Caryocaraceae) trees in the Brazilian Cerrado (Savanna). Percentage of defoliation and the number of phytophago...

1. The coconut mite Aceria guerreronis Keifer (Acari: Eriophyidae), is a destructive mite pest of coconut, causing significant economic losses. However, an effective pest management strategy requires a clear understanding of the geographical areas at risk of the target pest. 2. Therefore, we predicted the potential global distribution A. guerreroni...

The aim of this study was to develop a simple and efficient laboratory rearing method for Neoleucinodes elegantalis (Guen., 1854) (Lepidoptera: Pyralidae). To this end, seven bioassays were performed to evaluate the survival and reproductive characteristics of N. elegantalis for rearing populations in the laboratory with artificial and natural frui...

Insects' ethology is an important factor when it is desired to carry out pest management. This knowledge makes it possible to manipulate behavioral activities, repel, or attract insects according to needs and interests. The maize weevil Sitophilus zeamais (Mots., 1855) (Coleoptera: Curculionidae), one of the main stored grain pests, has been the ta...

Background: The Asian citrus psyllid (ACP) Diaphorina citri Kuwayama (Hempitera: Liviidae) is a destructive, invasive species which poses a serious threat to the citrus industry wherever it occurs. The psyllid vectors the phloem-limited bacteria "Candidatus Liberibacter americanus" and "Candidatus Liberibacter asiaticus", causal agents of the incu...

The impact of invasive alien pests on agriculture, food security, and biodiversity conservation has been worsened by climate change caused by the rising earth’s atmospheric greenhouse gases. The African citrus triozid, Trioza erytreae (Del Guercio; Hemiptera: Triozidae), is an invasive alien pest of all citrus species. It vectors the phloem-limited...

The tarsonemid Polyphagotarsonemus latus (Banks), an obligatorily phytophage, is a leading pest of the oilseed crop Jatropha curcas L. (physic nut), potentially reducing its yield. We explored interaction between P. latus and winged insects associated with J. curcas, particularly the whitefly (Bemisia tabaci [Gennadius, 1889]), considering the site...

1. Fertilization input is required to improve productivity and attend the market demand for tomatoes. However, providing crops with nutrients can affect plant–insect interactions via bottom‐up effects. The South American tomato pinworm, Tuta absoluta (Meyrick) (Lepidoptera: Gelechiidae), is a main pest of tomato crops worldwide but little is known...

The cashew (Anacardium occidentale) is a fruit tree grown in tropical regions producing the nut most consumed worldwide. The brown moth Anacampsis phytomiella (Lepidoptera: Gelechiidae) is the primary pest that attacks cashew nuts in the Neotropical region. Sampling plans are essential components of integrated pest management (IPM) programs. These...

Caryocar brasiliense Camb. (Malpighiales: Caryocaraceae) trees are widely distributed throughout the Cerrado ecosystem. The fruits of C. brasiliense trees are used by humans for food and as the main income source in many communities. C. brasiliense conservation is seriously threatened due to habitat loss caused by the land-use change. Sucking insec...

In the field, coffee is subject to the stress of soil compaction and lack of water, which may cause changes in the physiological responses of the plant. The objective of this study was to evaluate the physiological responses of the coffee tree under different soil moisture content and compaction degrees in the soil subsurface. The experimental desi...

Macaúba (Acrocomia aculeata) is a palm tree with a high potential for plant-based raw material production, particularly bioenergy production; it is one of the most promising species for cultivation on marginal lands. This study aimed to determine the distribution of A. aculeata species worldwide and verify the Köppen–Geiger climatic classifications...

Worldwide, conventional agriculture makes extensive use of pesticides. Although the effects of herbicides are relatively well known in terms of environmental impacts on non-target organisms, there is very little scientific evidence regarding the impacts of herbicide residues on aquatic arthropods from tropical conservation areas. This study evaluat...

The Neotropical brown stink bug (Euschistu sheros) was a minor pest in soybean fields until the 1970s. However, since the producing areas have expanded from the Southern to the Central areas in Brazil, this pest has changed its status. It is currently considered the main soybean pest in this country. The damage caused by E. heros results from its f...

The objective of this study was to model the spatio-temporal distribution of Digitaria insularis (D. insularis) and analyze the risk of selection of glyphosate-resistant biotypes in eucalyptus cultivation in Brazil. Global data on the distribution of the specie were collected and associated with their ideal growth characteristics. The models were g...

The red palm mite, Raoiella indica Hirst, is the most invasive pest, having spread quickly to several countries. In Brazil it is already present in several regions and has a high potential for dispersion to other regions, which could severely affect the cultivation of coconuts, bananas, native and exotic palm trees, and tropical flowers, such as th...

Soybean is one of the most cultivated and important legumes in the world. Given its importance, understanding the shifts of climate suitability for this crop under climate change is essential. One way to map these potential changes in soybean distribution is through species distribution models (SDMs). In this study, we conducted a SDM for soybeans,...

Recent agricultural expansion into regions of the Brazilian savannah or Cerrado has improved agricultural knowledge and management practices. Under this biome’s favorable conditions, the incidence of diseases such as gummy stem blight (GSB) could be a limiting factor for some crops (i.e., Cucumis melo L.), due to high losses in productivity and fru...

Chrysodeixis includens is a polyphagous pest restricted to the American continent. The occurrence of C. includens is allied, among other factors, by favorable conditions such as temperature, humidity, presence of hosts, and migratory behavior. In this work, we built spatiotemporal species distribution models at continental and global levels for the...

Biological control methods may provide efficient and environmentally sustainable methods for curbing invasive weeds. Miconia calvescens DC (Melastomataceae) is an invasive weed of forest ecosystems on oceanic islands and one of the most invasive alien species. Therefore, the present study aimed to identify and assess the population dynamics of herb...

BACKGROUND A variety of abiotic and biotic factors promoting seasonal variation in the population of insect pests. Knowledge of time and magnitude of these factors is important for the study of population dynamics and the development of efficient pest management programs. Currently, the are few studies regarding Tuta absoluta Meyrick (Lepidoptera:...

COVID-19 is spreading rapidly in Brazil, a country of continental dimensions, but the incidence of the disease is showing to be very heterogeneous, affecting cities and regions differently. Thus, there is a gap regarding what factors would contribute to accentuate the differences in the incidence of COVID-19 among Brazilian cities. This work aimed...

Fire blight, a disease of apple trees caused by Erwinia amylovora, occurs worldwide except in South America, South-Central Africa, and most of Oceania. Ecological niche models can determine the potential distribution of species and measure the risk of pest invasion. This study aims to develop global climate suitability models using MaxEnt software...

Background COVID-19 is spreading rapidly in Brazil, a country of continental dimensions, but the incidence of the disease is showing to be very heterogeneous, affecting cities and regions differently. Thus, there is a gap regarding what factors would contribute to accentuate the differences in the incidence of COVID-19 among Brazilian cities. This...

The European grapevine moth, Lobesia botrana (Lepidoptera: Tortricidae) is a pest that has great potential to cause damage to vineyards. Considering that L. botrana is one of the major grapevine pests globally, it is essential to analyze the risk of its introduction and determine places with higher potential for the establishment of this pest. In t...

Wood production from native tree species in Brazil is primarily limited to exploitation of natural forests. The identification of potential habitats for tree planting may provide new opportunities for natural forest conservation and management and increase the viability of native species plantations for highly valuable wood production. This study a...

Background: Herbivores cause biochemical, physiological, and morphological changes on plants. The ultimate effects of the herbivore activities are damages on the plant's body that can lead from local tissues death to the plant death. The intensity of herbivore attack and the plant's capability to defend itself determine the outcomes of herbivory. W...

The small tomato borer, Neoleucinodes elegantalis (Guenée) (Lepidoptera: Crambidae), is a significant pest of tomato crops in Central and South America, where its occurrence and abundance is dependent on environmental factors. The aim of this study was to determine the effects of climate variables on the abundance of N. elegantalis in open-field to...

Ceratocystis fimbriata plays a significant role in the initiation of the tree decline disease in mango (Mangifera indica L.), which can kill the plant. The C. fimbriata infection is linked with the presence of the beetle Hypocryphalus mangiferae (Curculionidae: Scolytinae). However, it is unknown how H. mangiferae aids in the transport of the fungu...

BACKGROUND Raoiella indica Hirst (Acari: Tenuipalpidae) is the most critical coconut and banana pest recently introduced in Brazil. Once mite pests are introduced, it is essential to understand their dynamics in important crops under open‐field climatic conditions to implement strategies for their management and determine the periods when species p...

Embrapa Roraima - Comunicado Técnico (INFOTECA-E)

Sampling plans are essential components to establish decision-making systems for integrated pest management (IPM) programs. Thus, this study was aimed to develop a conventional sampling plan of Tetranychus mexicanus (McGregor) (Tetranychidae) on the yellow passion fruit Passiflora edulis. The work was conducted in nine passion fruit fields with pla...

Tetranychus mexicanus (McGregor) (Acari: Tetranychidae) is one of the most significant pests that affect passion fruit in America. One way to reduce pesticides application is management using resistant plants as one of the highlights of integrated pest management programs. The first step to obtaining commercial pest-resistant cultivars is the selec...

Over the last 10 years, the insect Tuta absoluta has become one of the most important threats to agriculture worldwide. Since its introduction in Spain in 2006, this pest has infested 60% of the tomato crops in many regions of the world. Here we present the geographic distribution of T. absoluta at a global scale. Through the combination of spatial...

The savanna cashew (Anacardium humile A. St. Hil.) nut is a native shrub species distributed in the savanna biome of Central Western Brazil. This species is similar to the cashew (Anacardium occidentale L.) nut, and its edible pseudo-fruits have been used for various purposes. However, A. humile is at risk of extinction. One reason for this is the...

The sweetpotato whitefly, Bemisia tabaci (Hemiptera: Aleyrodidae), is an important pest in melon crops worldwide. Decision-making systems are an essential part of Integrated Pest Management (IPM) programs and are composed of sampling plans and economic injury levels (EIL). This study aimed to determine the EILs and develop sequential sampling plans...

Resumo O eucalipto é uma espécie de grande importância por apresentar rápido crescimento e uso múltiplo, com possibilidades de assegurar o suprimento de matéria-prima para as necessidades energéticas, a fabricação de celulose e papel, dentre outras finalidades. As mudanças climáticas observadas no planeta representam uma ameaça para o setor florest...