Chintalapati Padmavathi

• Doctor of Philosophy
• Principal Investigator at Indian Institute of Rice Research

Climate change affects insect species abundance, distribution pattern, habitat suitability, niche area, reproduction capacity, invasion risk and outbreak frequencies. Advances in phenology (the annual timing of species’ life-cycles) in response to climate change are generally viewed as bioindicators of climate change. The objectives our study is to...

Temperature and humidity have a significant impact on the growth and development of crops. Rice, an important grain crop, is very sensitive to temperature and heat stress. It helps in crop management in specific areas like monitoring temperature for the upcoming season, measuring crop phenology, pest outbreaks, suggesting heat-tolerant varieties an...

Changing climate conditions along with nutrient deficient soils adversely affect the environment and reduce rice production. Wild introgression lines derived from KMR 3 and O. rufipogon were evaluated in various environments to identify high yielding stress tolerant genotypes. DRR Dhan 74 (IET 30252) is a variety developed by IIRR, using parental l...

Preliminary screening studies against rice stem borer and leaf folder were conducted at Regional Agricultural Research Station, Pattambi during kharif 2016 and rabi 2016-17 involving 14 rice cultures and susceptible check TN 1. The promising rice genotypes were evaluated under All India Coordinated Research Project on Rice (AICRPR) Hyderabad during...

Temperature plays a crucial role in influencing the growth and development of crops. Rice, being a significant cereal crop, is highly sensitive to both low and high temperature stresses. Upcoming season temperature forecasts help in site-specific crop management, such as assessing crop growth, pest outbreaks, and suggesting heat-tolerant varieties...

Citation: Kumar, R.M.; Chintalapati, P.; Rathod, S.; Vidhan Singh, T.; Kuchi, S.; Mannava, P.B.B.B.; Latha, P.C.; Somasekhar, N.; Nirmala, B.; Madamsetty, S.P.; et al. Comparison of System of Rice Intensification Applications and Alternatives in India: Agronomic, Economic, Environmental, Energy, and Other Effects. Agronomy 2023, 13, 2492. Abstract:...

Initial evaluations of the System of Rice Intensification in India and elsewhere have mainly fo-cused on its impact on yield and income and have usually covered just one or two seasons. Re-searchers at the ICAR-Indian Institute of Rice Research conducted a more comprehensive evalua-tion of SRI methods over six years (six wet and six dry seasons), c...

The System of Rice Intensification (SRI) developed in Madagascar has spread to many parts of the world, including India. This study assessing insect pest prevalence on rice grown with SRI vs. conventional methods at multiple locations in India was prompted by reports that SRI-managed rice plants are healthier and more resistant to pest and disease...

In recent years, leaf folder incidence has been increasing in all rice ecosystems and is abundant during the wet season. Presently farmers are dependent on the use of toxic chemical pesticides alone for their management. Hence, an attempt was made to nominate genotypes developed at Agriculture Research Station, Bapatla for screening against leaf fo...

Insect resistant crop plants form the core component of Integrated Pest Management (IPM) due to their ability to reduce the crop losses and associated insecticide costs in addition to protecting the environment. In this review, various types of resistance being cited, resistance mechanisms and causal factors responsible with examples were discussed...

Extended Summaries of ICSCI-2022

Plants are in constant communication with their environment through chemical signaling. There have been tremendous strides toward the understanding of elicitors, biosynthesis and ecological functions, and factors affecting the plant volatile emissions in insect-plant interactions. Recent research has focused on the use of herbivore-induced plant vo...

The Asian rice gall midge (Orseolia oryzae (Wood-Mason)) is a major insect pest in rice cultivation. Therefore, development of a reliable system for the timely prediction of this insect would be a valuable tool in pest management. In this study, occurring between the period from 2013–2018: (i) gall midge populations were recorded using a light trap...

Temperature driven development of rice brown planthopper (BPH), Nilaparvata lugens (Stål) (Hemiptera: Delphacidae) population (biotype 4) was examined at seven constant temperatures (15, 18, 20, 25, 30, 32 and 35°C). Complete development of BPH from egg to adult was observed at constant temperatures ranging from 15 to 32°C with linear development o...

Enhancing productivity through integrated nutrient management is pertinent to sustainable intensification of agricultural ecosystems. Field experiments were conducted during kharif and rabi 2016 at the research farm of Indian Institute of Rice Research, Hyderabad, Telangana in a clay loam soil to study the effect of sea weed extract (Liquid Bio-sti...

The rice leaf folder, Cnaphalocrocis medinalis Guenée (Lepidoptera: Crambidae), an important foliage feeding insect in rice, Oryza sativa L. (Poaceae), is widely distributed throughout Asia, causing frequent outbreaks and considerable yield losses. Mutants of the rice strain Samba Mahsuri (MSM) represent unique plant material and are explored here...

AICRP Experiences on rice and rice based cropping systems

Rice leaffolder, Cnaphalocrocis medinalis is one of the key foliage feeding insects of great concern throughout Asia as it results in significant yield losses. High visibility of damage is triggering farmers to apply toxic pesticides for its management. Therefore, it is vital to identify new stable sources of resistance for leaffolder. Phenotyping...

Seaweed extract is a bio-stimulant that is a mixture of micro and macro nutrients, amino acids, carbohydrates, plant growth regulators and other elicitors. A field experiment was conducted during kharif at the research farm of Indian Institute of Rice Research to study the effect of different seaweed biostimulant (LBS6, LBS6_S, LBS-8, LBS-9 and LBS...

Grain yield of rice can decline to the extent of 10% for each 1oC increase in growing season minimum temperature above 32oC, which leads to severe water shortage due to climate change, causing about 20% net decline in rice yield in India. Several experiments were conducted in rice to reduce water requirement and enhance nutrient use efficiency, in...

Rice ecosystems including irrigated rice in India is infested with complex weed flora including semiaquatic and aquatic weeds which cause yield losses from 15 to 76% in rice crop. ICAR-Indian Institute of Rice Research (IIRR) under All India Co-ordinated Rice Improvement Programme (AICRIP) has conducted experiments across India (11 locations) to ev...

Rice leaffolder, Cnaphalocrocis medinalis, is one of the major foliage feeders found in the rice growing regions in India. When the crop was at maturity, numerous adults of rice leaffolder were found in the rice fields though the larval population gradually decreased, and no eggs were found on rice leaves. The population characteristics of C. medin...

Among the neo-nicotinoids, imidacloprid and thiamethoxam have been frequently used in planthopper endemic areas. Wherever leaffolder incidence occurs along with planthoppers in the rice fields, use of neo-nicotinoids has resulted in increase in leaffolder population. The present study was carried out to verify and confirm the resurgence as well as...

Field experiments were conducted at DRR farm located at ICRISAT, Patancheru, in sandy clay loam soils during four seasons, Kharif 2008, Rabi 2008–2009, Kharif 2009 and Rabi 2009–2010, to investigate growth parameters, water-saving potential, root characteristics, chemical, biological, and microbial properties of rhizosphere soil, and grain yield of...

Abstract The rice leaf folder, Cnaphalocrocis medinalis Guenée (Lepidoptera: Pyralidae) is a predominant foliage feeder in all the rice ecosystems. The objective of this study was to examine the development of leaf folder at 7 constant temperatures (18, 20, 25, 30, 32, 34, 35° C) and to estimate temperature thresholds and thermal constants for the...

Influence of leaffolder feeding on chlorophyll, PS II activity and plant–water relations, effect of larval density on leaf damage and time course studies on larval feeding behaviour on altered physiological changes in TN1 rice culture were studied. Quantification of yield losses in the field caused by leaffolder was also assessed. Leaffolder damage...

Biological control has come a long way and has been adapting to the changing needs of agricultural pest suppression. Changes in crop management practices, transgenic crops and new pesticide molecules have a profound effect on the natural pest suppression. Biocontrol like any other control technique is not without associated risks and cannot be cons...

Organic manuring influences the diversity of arthropods and their functional significance in rice fields. Arthropod diversity under eight organic manure regimes consisting of farmyard manure (FYM), vermicompost (VC), poultry manure (PM), neem cake (NC), FYM + 50% recommended fertilizer dose (50%RFD), VC+50% RFD, RFD, and unfertilized control (UC) w...

: Studies on the effect of saturated hydrocarbons on parasitization by the egg parasitoid Trichogramma chilonis Ishii were carried out in the laboratory and net house. Bioassay of 11 hydrocarbons, viz. pentadecane, heptadecane, ecosane, heneicosane, docosane, tricosane, tetracosane, pentacosane, hexacosane, octacosane and hexatriacontane, were carr...