Indian Journal of Entomology 83(2021) Online published Ref. No. e20228 DoI No.: 10.5958/0974-8172.2021.00024.9 EFFICACY OF INSECTICIDES AGAINST MAJOR DEFOLIATORS OF RICE SANDEEP KUMAR* AND KULDEEP SHARMA Department of Agricultural Entomology, College of Agriculture, V C Farm, Mandya, University of Agricultural Sciences, Bengaluru 571405 *Email: [email protected] (corresponding author) ABSTRACT A field experiment carried out at the College of Agriculture, V C Farm, Mandya, Karnataka evaluated the efficacy of insecticides viz., indoxacarb 15.8EC @ 0.5 ml/ l, flubendiamide 48SC @ 0.15 ml/ l, chlorantraniliprole 18.5SC @ 0.12 ml/ l, benfuracarb 3G @ 33 kg/ ha, cartap hydrochloride 4G @ 25 kg/ ha, fipronil 0.3G @ 25 kg/ ha, acephate 75SP @ 1g/ l and chlorpyriphos 20EC @ 2ml/ l against major defoliators of rice viz., rice hispa, leaf folder, caseworm and horned caterpillar during kharif, 2018. The reduction of leaf damage over untreated control after imposing treatments was maximum with flubendiamide 48SC (56.99-82.72%) followed by cartap hydrochloride 4 G (52.24- 79.69%). Also, flubendiamide 48SC @0.15 ml/ l was the most effective with maximum cost benefit ratio. Key words: Rice, defoliators, insecticides, efficacy, flubendiamide, cartap hydrochloride, indoxacarb, chlorantraniliprole, benfuracarb, fipronil, acephate, chlorpyriphos, cost benefits Rice (Oryza sativa L.) is one of the most important include: indoxacarb 15.8EC @0.5 ml/ l, flubendiamide cereal crops of the world, and its productivity is 48SC @0.15 ml/ l, chlorantraniliprole 18.5SC @0.12 hampered by insect pests. Amongst these the defoliators ml/ l, benfuracarb 3G @33 kg/ ha, cartap hydrochloride viz., rice hispa, Dicladispa armigera Oliver, leaf 4G @ 25 kg/ ha, fipronil 0.3G @ 25 kg/ ha, acephate folder Cnaphalocrocis medinalis Guenee, caseworm 75SP @1g/ l, chlorpyriphos 20EC @ 2ml/ l and untreated Nymphula depunctalis Guenee and horned caterpillar control. The variety Jaya was sown with a spacing of 20x Melanitis leda ismene Cramer are of major importance 15 cm, in plot size of 4x 4.5 m with a total of 108 subplots. and cause economic damage (Sidde Gowda and The evaluated insecticides were used as soil application/ Gubbaiah, 2011; Bhattacharjee and Ray, 2010; Ahmad foliar spray, with granular insecticides being benfuracarb, et al., 2010; Alvi et al., 2003; Singh and Singh, 2014; cartap hydrochloride, fipronil applied seven days Pathak and Khan, 1994). Of these, the rice horned before those applied as foliar spray. The pretreatment caterpillar usually occurs in less number and infest rice observations were made a day before treatment, and crops of lowland and upland. This pest has gained major the post treatment counts at 1, 7 and 14 days after. For pest status in various parts of India. In Southern parts rice hispa counts were made on 10 randomly selected of Karnataka, the infestation of all these defoliators plants/ replication by counting number of leaves showing have become serious for the past two decades causing feeding damage by adults (white parallel streaks along heavy damage in both kharif and summer crops. Since, leaf axis) and total number of leaves, and % leaf damage the southern parts of Karnataka are important rice computed. For rice leaf folder it was computed with the growing region in the state, the management of these number of folded leaves (scrapping on leaf blade). In case defoliators are of prime importance. The present study of rice caseworm, it was done with number of leaf cases, evaluates the efficacy of some insecticides against the and for horned caterpillar it was done with the damaged major defoliators. leaves (defoliated leaf blade irregularly) (IRRI, 2013). At harvest, yield of grain and biomass were recorded, with MATERIALS AND METHODS data converted to q/ ha. The data of % leaf damage was The field experiment was carried out in kharif, subjected to suitable transformation before ANOVA and 2018 at the College of Agriculture, V C Farm, Mandya, means were separated by Tukey’s HSD (Tukey, 1953). Karnataka (12032’N, 76053’E, 690 masl) during kharif, Further, cost economics was worked out by following 2018. l. For each defoliator, separate experiment was formula. laid out in Randomized Completely Block Design with Benefit Cost Ratio = (Net profit (Rs.) three replications in each treatment. The treatments (Total cost (Rs.) 2 Indian Journal of Entomology 83(2021) Online published Ref. No. e20228 RESULTS AND DISCUSSION against rice leaf folder. Similarly, Javaregowda and Naik (2005) and Kulagod et al. (2011) also indicated The results revealed that with D. armigera, the that flubendiamide 39.35SC was the best against rice pretreatment data varied from 2.03 to 2.41%, and 2.02 defoliators. Similarly, Seetharamu et al. (2005) and to 2.39 on one day after treatment (DAT); seven DAT Sachan et al. (2006) revealed the superiority of cartap least damage (1.61%) was observed with acephate 75SP hydrochloride against lepidopteran pests of rice. Thus, which was on par with that of flubendiamide 48SC flubendiamide 48SC @ 0.15 ml/ l was found to be the (1.67%) and cartap hydrochloride 4G (1.72%); on 14 most effective insecticides against defoliators of rice DAT 1.13% damage was observed with flubendiamide followed by cartap hydrochloride 4G @ 25 kg/ ha. 48SC which was on par with cartap hydrochloride 4G However, the flubendiamide 48SC @ 0.15 ml/ l and (1.33%). Thus, reduction of damage at 14 DAT was more indoxacarb 15.8 EC @ 0.5 ml/ l gave maximum cost in flubendiamide 48SC (59.78%). Maximum grain yield benefit. (61.12 q/ ha) was obtained with flubendiamide 48SC followed by cartap hydrochloride 4G (57.22 q/ha). The ACKNOWLEDGEMENTS maximum cost benefit was 1:3.07 with flubendiamide 48SC. For C. medinalis, the pretreatment observations The authors thank the Department of Agricultural revealed 9.70 to 10.92% damage, and 1 DAT, it was Entomology, College of Agriculture, Mandya, 9.62 to 10.34%, with significant differences observed University of Agricultural Sciences, Bengaluru for 7DAT- the least damage (6.09%) was observed in providing necessary facilities. The award of ICAR-NTS flubendiamide 48SC followed by cartap hydrochloride 4 (National talent scholarship) to the first author is also G (6.43%) against 13.97% in untreated control. After 14 acknowledged. DAT similar results were obtained with flubendiamide REFERENCES 48SC which was on par with cartap hydrochloride 4G, with maximum reduction of 82.72% in damage over Ahmad H, Khan R B, Sharma D, Jamwal V V S, Gupta S. 2010. Seasonal incidence, infestation and trap catches of Cnaphalocrocis medinalis untreated control. Maximum yield of 66.47 q/ ha was in rice. Annals of Plant Protection Sciences 18(2): 380-383. observed with flubendiamide 48SC giving cost benefit Alvi S M, Ali M A, Chaudhary S, Iqbal S. 2003. Population trends and being 1:3.15 (Table 1, 2). chemical control of rice leaf folder, Cnaphalocrocis medinalis on rice crop. International Journal of Agriculture and Biology 5(4): Against N. depunctalis which was showing a 615-617. pretreatment damage at 9.79 to 10.66%, and 9.75 Bhattacharjee P P, Ray D C. 2010. 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