SUMMARY :In the Indian subcontinent the sunflower (Helianthus annuus L.) crop is fast expanding to different agroecological niches and cropping systems due to its wide adaptability.Among biological constraints in the sunflower production, pests dominate the scenario. A diverse assemblage of both beneficial and harmful insect species is associated with the sunflower ecosystem. Though more than fifty insect species have been reported on sunflower, cutworms (Agrotis spp.), sucking pests, leaf and plant hoppers (Amrasca biguttula biguttula Ishida, Empoasca spp.), thrips (Thrips palmi), whitefly (Bemisia tabaci Gennadius), defoliators (Spilosoma obliqua Walker, Spodoptera litura Fabricius, and Plusia orichalcea Fab.) and capitulum borer (Helicoverpa armigera Hubner) are major pests of economic concern. Therefore, the present experiment was undertaken to screen the available germplasm of sunflower for resistance to defoliators (Spilosoma obliqua Walker, Spodoptera litura Fabricius, and Plusia orichalcea Fab.), and capitulum borer (Helicoverpa armigera Hubner), which may be further used for conversion in to resistant hybrids, in Augmented Block design consisiting of 4.5 m row of each germplasm with infester row of susceptible check (morden). Among entries screened, the population of defoliators (Spodoptera, Trichoplusia and Spilosoma) was moderate ranged between 0.53(GMU-973)-1.48/plant (GMU-902) and Helicoverpa 0.1 to 1.20 /head. The entries GMU-942 and 948 has minimum incidence i.e. 0.1 larva/head of sunflower.How to cite this article : Jayewar, Nareshkumar E., Gosalwad, Sadashiv S. and Sonkamble, Milind M. (2017). Evaluation of germplasm against major lepidopteron pest in sunflower. Agric. Update, 12(TECHSEAR-1) : 62-67;
SUMMARY :A field experiment in paired plot design with two treatments and sixteen replications was laid out at experimental farm of Oilseeds Research Station, Latur, to assess the relative abundance and extent of damage caused by the various pests attacking sunflower in the Marathwada region of the Maharashtra state during the 2011 and 2013 in Kharif seasons. Selective applications of insecticides such as quinalphos , profenophos and Spinosad was deployed in field experiments to determine the extent of damage caused by the defoliators of the sunflower. For the management of other sucking pest and head borer selective insecticides treatment was given in both protected and unprotected plots of the experiment. Pooled results indicated that sunflower crop left unprotected recorded significant yield reduction to the extent of 20.29 per cent as compared to crop protected through chemicals.How to cite this article : Jayewar, Nareshkumar E., Gosalwad, Sadashiv S. and Sonkamble, Milind M. (2017). Estimation of yield losses caused by defoliators in sunflower. Agric. Update, 12(TECHSEAR-1) : 54-57;
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