Seasonal Incidence and Management of Yellow Stem Borer Scirpophaga Incertulus (Walker) in Rice Crop and Effect of Insecticides on Spider Population

Abstract

Rice (Oriyza saliva L.) 1s one of the most 1mportant cereal crop of the country and is a staple food of more than 65 per cent of 1ts populat1on, 11 accounts for about 43 per cent of total food gra1n produclton and 55 per cent of cereal production in the country contnbutmg 20-22 percent of the agriculture G.D P (Singh 2009). Yellow stem borer (S incertulas) IS common in Southeast Asia, China, India, and Afghanistan Yellow stem borer larvae cause dead hearts and whiteheads Dead hearts are the dr ed- up central shoots of lillers while whiteheads are the discolored pamcles with empty or part1ally filled grams These visible symptoms vary at the plant growth stages at wh1ch mfestation begin. An mvestigation was earned out to study the ·seasonal 1nc1dence and management of yellow stem borer S incertulus (walker) 1n nee crop and eflect of insecticcdes on sp1der populal1on 1n random•zed block des1gn w1th three replications at Crop Research Center of Sardar VallabhbhaJ Patel university of agriculture and technology, Mod1puram, Meerul Dunng the crop season eleven msect spec1es were found attack1ng the nee at dtfferenJ crop growth stages The yellow stem borer S mcertutas (Walker) was recorded as maJor pest The •nc•dence of S mcertutas (Walker) was recorded on the f~rst on third week of July and reached to 1Ls peaks (9 20 per cent wMe ea•) dunng m•ddle of October when average temperature and relat•ve hum1d1ty were 29 3°C and 78 0 per cent respectively The •nctdence of S incertulas (Walker) was negative at higher temperature and pos1t1ve correlated with all the other weather parameters. Efficacy of dtfferent insecticide tnazatphos 40 EC (0 75 L•llha) cartap hydrochloride 4 G (18.75kg/ha) oambada · cyhalothnn SEC (0 625hVha) Endosulfan 35EC 11 ShVha) Cartap hydrochlonde 50 SP (1kg!ha) Neemann {3htlha) B thurmgdnsis 1 5 kg!ha). and Ftpronil 5 SC {0 5Whal was tested aga1nst S mcertulas 'Walker) F•proml 5 SC was found most effect•ve lreatment m reducing the dead hart as well as white ear format1on as II was 3.43 percent after 21 days of 101 and 2nd application, respectively the next best treatment were cartap hydrochloride 50 SP and tnazophos 40 EC w1th 3 90 and 4 23 percent dead hart formation and 2 99 and 2 96 white ear format•on respechvety alter 21 days both the spray The h•ghest onfestahon o' 8 80 ar'ld 9 93 .vas found 21 days alter the frst and second appl1cabon resoect.vely The tugher y•etd 145 83 qlna} and cost benet t rat o (1 14 ~~} ''ere also obtaoned from F•pron•f 5 SC B 1/wnngiiiiSIS was found safer to sp•der population fallowed by Neemann 1500 ppm at all observational Interval