Navneet Kaur

Oregon State University | OSU · Department of Crop and Soil Science

Plant species in the family Solanaceae are the usual hosts of potato psyllid, Bactericera cockerelli (Šulc) (Hemiptera: Psylloidea: Triozidae). However, the psyllid has also been shown to develop on some species of Convolvulaceae (bindweeds and morning glories). Developmental success on Convolvulaceae is surprising given the rarity of psyllid speci...

The clover seed weevil, Tychius picirostris Fabricius (Coleoptera: Curculionidae), is a major pest in Oregon white clover seed crops. Reliance on synthetic pyrethroid insecticides and limited availability of diverse modes of action (MoAs) has increased insecticide resistance selection in regional T. picirostris populations, emphasizing the need to...

The subterranean sod webworm, also known as cranberry girdler (Chrysoteuchia topiaria), is one of the most damaging insect pests in cool‐season grass grown for seed crops in Oregon. Chemical control options are limited and require irrigation or rainfall for adequate insecticide incorporation to control C. topiaria larvae. Epichloë endophytes associ...

Red clover (Trifolium pratense L.), a perennial forage legume belonging to the Fabaceae family, is grown for seed in many temperate regions of the world. Coleophora deauratella Leinig and Zeller (Lepidoptera: Coleophoridae) is a significant insect pest occurring globally in several primary red clover seed-producing regions. Coleophora deauratella i...

The clover seed weevil, Tychius picirostris Fabricius, a serious pest of white clover, Trifolium repens L., grown for seed in western Oregon, causing feeding damage to flowers and developing seeds. Since 2017, white clover seed producers have anecdotally reported T. picirostris control failures using foliar pyrethroid insecticide applications. This...

Red clover casebearer moth (Coleophora deauratella) (Leinig and Zeller) (Lepidoptera: Coleophoridae) is an invasive insect pest in red clover (Trifolium pratense L.) seed production systems in North America and New Zealand. Recent discoveries of C. deauratella in Oregon and New Zealand prompted research investigating the seasonal phenology and popu...

This study is an efficacy trial of various pesticide chemistries on their potential for symphylan repression. A field trial was performed in spring and fall in a symphylan infested field at oregon State University's Hyslop Farm. Four replications of six treatments and one control were top dressed and using a rototiller, incorporated into the soil....

The worm slug Boettgerilla pallens Simroth, 1912, is reported in Washington State for the first time with records from King, Pierce and Snohomish counties.

The worm slug Boettgerilla pallens Simroth, 1912, is reported in Washington State for the first time with records from King, Pierce and Snohomish counties.

Asian citrus psyllid Diaphorina citri Kuwayama (Hemiptera: Psyllidae) is an important economic pest of citrus crops because it vectors the causal pathogen of huanglongbing (HLB; aka citrus greening). Population suppression of D. citri with insecticides has been disproportionally relied on for HLB management and a greater diversity of more sustainab...

2019-2020 Insect monitoring and season phenology

2020 Insect monitoring and notes on parasitism

Introduction The red clover casebearer moth, Coleophora deauratella (Lepidoptera: Coleophoridae), is an invasive insect species predominantly occurring in the red clover (Trifolium pratense L.) seed-growing regions of North America. Since its first detection in Oregon in 2011, intermittent monitoring of this pest using pheromone traps in red clover...

Year 2- lab bioassays for insect resistance to synthetic pyrethroids

A sex-pheromone-baited trapping method was utilized to capture male moths at commercial red clover field sites (Table 1). One green UniTrap® was placed in each field at least 100 feet from the field edge and at crop canopy height. A gray septum infused with the pheromone lure was placed in each trap. An insecticide vapor strip was placed inside the...

This paper presents preliminary data on a field efficacy trial for the management of sod webworm, Chrystotechia topiara.

This paper presents preliminary data on lab screening of grass seed cultivars against sod webworm, Chrysoteuchia topiara.

Ergot, caused by Claviceps purpurea sensu lato, is an economically important seed replacement disease of Kentucky bluegrass (Poa pratensis) and perennial ryegrass (Lolium perenne) seed crops. Claviceps purpurea sensu stricto is considered the primary Claviceps species responsible, but genetic diversity and cryptic species within C. purpurea sensu l...

Our previous study provided correlative evidence that morning glory species harboring endophytic fungi (Periglandula) are resistant to potato psyllid [Bactericera cockerelli (Šulc)], whereas species free of fungi often allowed psyllid development. In this study, we manipulated levels of ergot alkaloids in host tissues by inoculating clippings from...

The psyllid Bactericera maculipennis (Crawford) (Hemiptera: Triozidae) specializes on plants in family Convolvulaceae, with host records from rearing assays currently limited to four genera: Convolvulus, Ipomoea, Calystegia, Jacquemontia. Plants in the Convolvulaceae are unusual among the dicots in exhibiting a symbiotic association with a fungal e...

Core Ideas Insects were captured from the perennial ryegrass seed fields during 2014–2015 growing seasons to investigate the association between insect abundance with ergot disease incidence. An accurate and specific high‐fidelity PCR technique was also developed for the rapid detection of Claviceps spp. conidia carried by insects. A positive corre...

Arrival and spread of nonnative plant species can lead to changes in structure and function of the native insect fauna that include shifts in host use by native insect herbivores. Well-documented examples showing that these host shifts also lead to range expansion of native herbivores are, however, surprisingly rare. Evidence for range expansion re...

Genetic distance from potato as calculated by Geneious®. (DOCX)

Plant species in the family Solanaceae are the usual hosts of potato psyllid, Bactericera cockerelli (Šulc) (Hemiptera: Psylloidea: Triozidae). However, the psyllid has also been shown to develop on some species of Convolvulaceae (bindweeds and morning glories). Developmental success on Convolvulaceae is surprising given the rarity of psyllid speci...

The U.S. Pacific Northwest states of Oregon and Washington are major producers of cool-season grass seed. Ergot, caused by fungi in the Claviceps purpurea sensu lato group, is an important seed replacement disease of grass worldwide. Microscopic methods that are currently used to quantify airborne Claviceps ascospores captured by spore traps are no...

Claviceps purpurea, the causal agent of ergot of perennial ryegrass seed crops, overwinters as sclerotia in the soil and releases airborne ascospores in the spring that infect flower ovaries and replace seed with sclerotia. Burkard spore traps were used to quantify the dispersal phenology and concentration of ascospores in perennial ryegrass seed f...

Core Ideas Cultural control of southern chinch bug in St. Augustinegrass by following recommended guidelines for mowing heights based on turfgrass cultivar, and practicing thatch management may reduce insecticide use and nontarget impacts. Turf parameters (turf height and thatch thickness) were closely associated to southern chinch bug densities ob...

Plant growth regulators are known to influence a plant's characteristics and therefore can be used as an alternative strategy in making Blissus insularis Barber (Hemiptera: Blissidae) habitat unfavorable for this insect's survival. The reduction of B. insularis population densities following the application of mefluidide and trinexapac-ethyl in fie...

Claviceps purpurea, causal agent of ergot, infects the unfertilized flowers of Lolium perenne (perennial ryegrass; PRG) resulting in the production of sclerotia instead of seed. PRG cultivars with short, uniform flowering periods or those that flower when ascospores are absent may escape infection. In 2014, twelve PRG cultivars were evaluated for k...

Viruses that cause necrotic symptoms in potato tubers can be difficult to distinguish based on symptoms and frequently require multiple molecular tests to identify the pathogen. In this study, a multiplex RT PCR high fidelity PCR protocol was developed using previously validated primers that could accurately detect six important potato viruses and...

The fungal pathogen, Claviceps pupurea (Fr.:Fr.) Tul. is known to cause ergot disease of grass seed crops in Columbia Basin region of Washington and Oregon. This disease has been particularly difficult to manage. The fungus targets the unfertilized flowers and replaces the seed content with fungal mycelia. The infected ovaries then produce conidia...

The southern chinch bug, Blissus insularis (Barber), is a major insect pest of St. Augustinegrass. Feeding damage stunts plant growth and kills entire lawns, often requiring new sod and frequent insecticide applications in Florida. Because of the repeated development of insecticide resistance, cultural practices that maintain quality turfgrass and...

The southern chinch bug, B. insularis Barber (Hemiptera:Blissidae) is the most destructive insect pest of St. Augustinegrass and cause severe damage when its population reaches high densities by killing grass in small patches or entire lawn (Reinert and Kerr 1973). Excessive nitrogen inputs, drought stress and thatch thickness are believed to promo...