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The field experiment was carried out to evaluate the efficacy of different insecticides against hoppers on rice. The result revealed that, pymetrozine 50 WG was the best in reducing the white backed plant hopper (WBPH) and green leaf hopper (GLH) with 2.95 and 2.89 hoppers per hill, respectively, which was followed by clothianidin 50 WDG (3.05 WBPH and 2.99 GLH per hill) and flonicamid 50 WG (3.45 WBPH and 3.33 GLH per hill). The treatments imidacloprid 70 WG (4.47 WBPH and 3.87 GLH per hill) and fipronil 5 SC (5.61 WBPH and 4.44 GLH per hill) were found moderately effective, while bifenthrin 10 EC (6.76 WPBH and 4.92 GLH per hill) and cartap hydrochloride 50 SP (7.07 WBPH and 5.45 GLH per hill) were found to be the least effective in managing the WBPH and GLH. In case of natural enemies' population, no detrimental impact of insecticides was observed on the population of spiders as the treatment differences were non-significant. Amongst the seven insecticides evaluated, pymetrozine 50 WG treated plots recorded the highest grain and straw yield. [ABSTRACT FROM AUTHOR]

Whitebacked Planthopper is a sucking phloem sap insect which can greatly affect quality of the grain and yield losses. Determination of the resistance and susceptibility to WBPH is very important to accurate QTL analysis. The main objective of the study was to examine the level of resistance to determine optimum screening time using 120 doubled haploid lines. CNDH populations were developed from anther culture of F1, which was derived after a crossing WBPH, Sogatella furcifera resistance 'Cheongcheong' and susceptible 'Nagdong' lines. The genetic map with average 9.6 CM between markers was constructed from 120 CNDH populations, which included 217 SSR markers. Four QTLs were detected at different time and points based on the rate of seedling mortality after WBPH infestation. The markers were found to be comprehensive in identification of genotype and phenotype at coincident rate of 95% 14 days after infestation. These markers are efficiently very useful for MAS and develop new varieties in rice breeding program. [ABSTRACT FROM AUTHOR]

During rice cultivation, brown planthopper (BPH, Nilaparvata lugens Stal.) and white-backed planthopper (WBPH, Sogatella furcifera) infestations cause decreased yield and rice quality. In this study, we attempted to develop multi-resistance plants and increase the marker-assisted selection (MAS) efficiency. The frequency of callus induction in 95 F doubled haploid lines (DHLs) derived from JSNDH13 (BPH resistance)/CNDH32 (WBPH resistance) ranged from 3.8 to 15.2 %. The plant regeneration rates varied from 2.9 to 39.3 %. Selected 75 DH plants were used to compare the results of WBPH bioassay and DNA marker reaction. The DHL bioassay showed continuous gene distribution and resistance score ranged from 0.5 to 9.0 (mean, 4.2). The broad-sense heritability for WBPH resistance was 51.7 %. The DHLs from the cross of JSNDH13/CNDH32 were segregated into 39 resistant (R):36 susceptible (S) to WBPH, i.e., 1 RR:SS. For the bioassay and MAS, RM11669 with WBPH resistance was selected. Genetically, the use of resistant cultivars, MAS, and DH breeding has proven to be environment friendly, efficient, and economical. This study confirmed the genetic basis for MAS to improve WBPH resistance in DHLs of WBPH/BPH resistant rice plants. [ABSTRACT FROM AUTHOR]

All ecofriendly alternative to chemical pesticides is biopesticides, which encompasses a broad array of microbial pesticides, biochemicals derived from micro-organisms and other natural sources, and processes involving the genetic incorporation of DNA into agricultural commodities that confer protection against pest damage. The field studies were carried out for effectiveness of insecticides and biopesticides against White backed Plant Hopper on rice in rewa region. Study of insect pest complex was done from 2006-07 to 2007- 08. The observations were made regarding the grain yield monocrotophos was the most efficient insecticide where as among biopescides wanis was the best. [ABSTRACT FROM AUTHOR]