Studies on the biology, population dynamics and screening of rice germplasm for resistance against brown planthopper, nilaparvata lugens (Stal)
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Date
2013
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CCSHAU
Abstract
Field experiment entitled “Studies on the biology, population dynamics and screening of rice germplasm for resistance against brown planthopper, Nilaparvata lugens (Stal)” was conducted at research farm of Department of Entomology, Rice Research Station, Kaul, Kaithal (290 51′ 29.5" N latitude, 760 39′ 24.3" E longitude and elevation 230.7 m), CCS HAU, Hisar during Kharif, season 2011 and 2012. The eggs were laid in clusters of 3 to 14 eggs per cluster. Maximum eggs on leaf sheath (89.4%) followed by midrib (7.2%) and minimum (3.7%) eggs were laid in stem. The egg stage lasted for 9.6±0.24 days and 80.20 per cent hatchability. The planthopper nymph passed through five instars. The mean duration of third instar was maximum. The nymphal period ranged from 16-20 days with a mean value of 18.3 days at mean minimum and maximum temperatures of 24.8 and 30.6 ºC, respectively. Nymphal survival and adult emergence was 85 per cent. The sex ratio was 1: 1.31 (Male: female). The pre-ovipositon, oviposition and post-oviposition periods were 3.1, 13.0 and 5.0 days, respectively. Longevity of males and females ranged from 14-18 and 18-22 with an average period of 15.9 and 20.1 days, respectively. On an average a female laid 118.2 (89-146) eggs during its life span. The population of BPH appeared during 31st standard meteorological week (SMW) and 32nd SMW during 2011 and 2012, respectively and reached on its peak in 39th SMW during both consecutive years except on variety CSR 30 planted in June where it was in 37th and 42nd SMW during 2011 and 2012, respectively. The population build up of BPH was significantly differed with respect to varieties and dates. The population of BPH was higher on CSR 30 as compared to PR 114 during the study periods. Population of spiders occurred simultaneously with BPH. The population of mirid bugs appeared late and was highest in October during both years. Other natural enemies (parasitoids and beetles) remained low throughout the sampling period. The population of BPH was positively correlated with spiders, mirids and parasitoids while a highly negative correlation was observed with minimum temperature and rainfall on both varieties during 2011 and 2012. Out of 178 rice genotypes, 5 were found resistant (R), 28 were moderately resistant (MR), 102 genotypes were rated as moderately susceptible (MS) and 43 susceptible (S) with damage score 3, 5, 7 and 9, respectively. Four promising genotypes were found resistant in screen house during 2012.
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Keywords
Rice, Planting, Fruits, Cultivation, Eggs, Population dynamics, Bugs, Sexual reproduction, Animal developmental stages, Planting equipment