Please use this identifier to cite or link to this item: http://krishikosh.egranth.ac.in/handle/1/85335
Authors: SHILPAKALA, VALASAMMAGARI
Advisor: RAJENDRA PRASAD, P
Title: STUDIES ON POPULATION DYNAMICS AND MANAGEMENT OF MAJOR INSECT PEST COMPLEX IN CASTOR
Publisher: ACHARYA N.G. RANGA AGRICULTURAL UNIVERSITY
Citation: 124p.
Language: en_US
Type: Thesis
Series/Report no.: D5023;
Agrotags: castor (genus), planting, biological interaction, crops, animal developmental stages, sowing, humus, selection, insecticides, environmental degradation, POPULATION, DYNAMICS, MANAGEMENT, MAJOR INSECT, PEST, COMPLEX, CASTOR
Abstract: Studies on population dynamics of major insect pest complex on popular varieties of castor, screening of certain castor genotypes against leafhoppers and castor shoot and capsule borer besides evaluation of efficacy of new insecticide molecules against insect pest complex of castor. These three trials were conducted in Dryland farm of Sri Venkateswara Agricultural College, Tirupati, Andhra Pradesh during kharif, 2013. Seasonal incidence of major insect pests of castor viz., leaf hopper (Empoasca flavescens), leaf miner (Liriomyza trifolii), shoot and capsule borer (Conogethes punctiferalis), castor semilooper (Achaea janata), tobacco caterpillar (Spodoptera litura) and castor butterfly (Ergolis merione) were observed in three dates of sowing in two popular genotypes i.e., Haritha and PCH-111 during kharif, 2013. The incidence of major insect pests viz., leafhopper, leaf miner, tobacco caterpillar and semilooper was first appeared 15 DAG whereas castor butterfly and shoot and capsule borer appeared at 50 DAG. Whatever may be the date of sowing in both the cultivars peak incidence of insect population was recorded in 38th, 39th and 40th standard weeks whereas the tobacco caterpillar reached its peak incidence during October. The correlation studies on leaf hopper with abiotic factors showed that in both cultivars with three sowing dates, maximum temperature, minimum temperature and sunshine hours are positively correlated and negatively correlated with rainfall, whereas for tobacco caterpillar maximum temperature, minimum temperature are negatively correlated and morning and evening relative humidity are positively correlated. The serpentine leaf miner, shoot and capsule bore and castor butterfly are positively correlated with maximum temperature, minimum temperature and sunshine hours. xv Screening of twenty one genotypes with three checks namely Haritha, kranthi and kiran against leaf hopper and capsule borer revealed that mean number of leafhopper population varied significantly among the accessions and high incidence was noticed in the cultivars DPC-9 (7.41) followed by DCH-111(6.43). The least number of population was observed in M-574 (2.97), 48-1 (2.89) and PCH-294 (2.80) and they were on par with each other. The capsule damage caused by shoot and capsule borer in all the accessions was significant and the damage ranged from 13 to 47.29 per cent. The highest percent capsule damage was recorded in DPC-9 (47.29), PCS-262 (32.78) and PCS-171 (30.79). The least incidence was found in GCH-4 (13.17), PCH-288 (14.47) 48-1 (16.78), PCH-111 (17.37) and PCH-254 (17.39). The remaining cultivars showed the damage per cent of 20-30. The entries with triple bloom, loose spike, non-spiny capsules were found to be resistant to leaf hopper and capsule borer when compared to the entries with zero and single bloom, compact spike and bold, spiny capsules. Evaluation of different insecticides against major insect pests of castor revealed that all the treatments were found significantly superior over untreated control in reducing pest population and capsule damage. Cumulative efficacy revealed that imidacloprid 17.8 SL @ 0.3 ml l-1 (60.64%) followed by monocrotophos 36 WSC @1.6 ml l-1 (55.07%) and dimethoate 30 EC @ 2 ml l-1recorded highest in reducing the leaf hopper population. The lepidopteran pests viz., capsule borer (65.11%), tobacco caterpillar (83.99%) and semilooper (85.72%) were controlled by chlorfenapyr 10 SC @1.5 ml l-1. Flubendiamide 480 SC @ 0.2 ml l-1, emamectin benzoate 5SG @ 0.2 g l-1, monocrotophos 36 WSC @ 1.6 ml l-1 and rynaxypyr 18.5 SC @ 0.3 ml l-1 found to be effective on capsule borer by reducing the percent of infestation over untreated control to 59.45, 55.60, 53.87 and 49.65. The highest yield was recorded with spray application of chlorfenapyr (1973.6 kg ha-1) followed by monocrotophos (1636.57 kg ha-1). The next best yields were recorded by the treatments rynaxypyr (1592.59 kg ha-1), emamectin benzoate (1527.77 kg ha-1) and flubendiamide (1476 kg ha-1). The yield of castor sprayed with bifenthrin (1250 kg ha-1), imidaclorid (1042.13 kg ha-1) and chlorpyriphos (1030 kg ha-1) gave moderate yield.
Subject: ENTOMOLOGY
Issue Date: 2014
Appears in Collections:Thesis

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