Behavioural studies of Helicoverpa armigera (Hubner) (Lepidoptera: Noctuidae) and its management in chickpea

Srigiriraju, L (2000) Behavioural studies of Helicoverpa armigera (Hubner) (Lepidoptera: Noctuidae) and its management in chickpea. Masters thesis, Pondicherry University.

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The research activities entitled. " Behrvioural studies of Helicoverpa armigera (Hubner) (Lepidoptera : Noctuidae) nnd its management in chickpea ",conducted during post-rainy season, 1999.2000. at International Crops research Institute for the Semi-arid Tropics, Patanchem location, Andhra Pradesh, India, indicated that, by the pheromone trap catches of Harmigeru males, the peal\ mo~h activity war found to he between 0200 and 0400h. The environmental factors temperature, humidity and wind velocity appear to have a marked effect on the moth catch but were ~uerely coincidental with the time of the night. The research conducted on the orientation and flight pattern towards the pheromone source in l?larmigern suggests that it consists of several distinct stages with deviation from a straight upwind path taking place largely in the vertical plane, with different fight patterns. The ovipositional prcfcrcnce of Harmigeru to flower color variation in pigeonpea have shown a remarkable preference towards yellow colored flowers (X3.3)to oviposit than to the red colored flowers (36) in the choice tests. Though the female laid less number of eggs (56.4) on the red color flowers than yellow (64) in no-cholce tests, the differences were not significantly different. All the treatments that were tested against H urmigerir were found to be significantly superior to the unspraycd plots. 111 managing die larval population of the pest. The effectiveness of various treatments on H.urmigeru were in the order of Endosulfan (37 percent reduction over control) followed hy TPM (30), NPV (27). Annona (28). Neem (22) and erecting bird perches (21). Endosulfan registered the lest percentage pod damage (?US), followed by IPM (22.6) as against the highest percentage pod damage in control (40.7) A nlaximum yield of 13.9 q ha "was obtained with endosulfan, but was on par ~71thIP M (13.6 q ha .') as against 8.5 q ha'' in the control plots IPM was adjudged as the most profitable way to manage the pest, with little inputs on pesticides, which recorded a cost-benefit ratio of 1 :9 followed by endoslllfan treatment (l:8.7), The studies on the fluctuation of H armigcrcr pest population revealed that the larval population attained two major peaks, at 68 and 90 days of crop age, which coincided with peak flowering and podding stages of the crop respectively.

Item Type: Thesis (Masters)
Subjects: Mandate crops > Chickpea
Depositing User: Users 6 not found.
Date Deposited: 18 Aug 2011 10:39
Last Modified: 18 Aug 2011 10:39
Acknowledgement: 1 feel it as a privilege to work at International Crops Research Institute for the Semiarid Tropics (ICRISAT), Asia Region, Patancheru location, one of the premier Agricultural research institutes, under the Consultative Group on International Agricultural Research (CGIAR). It gives me pleasure to thank Dr. G.V. Ranga Rau, Special Project Scientist (IPM), IFAD project. NRMP, ICRISAT, for giving me an opportunity to work under him. He has given me the lihcrty to choose the reaearch problem of my own interest. I couldn't have accomplished the task of presenting my findings , without the suggestions offered by him. 1 place on record my sincere thanks to my Faculty Advisor, Dr. D. Ramamoorthy, Senior Lecturer, Salim Ali School Of Ecology, Pondicherry University, Pondicheny, for his kind of help and co-operation during my M.S. programme. 1 extend mv. dee.p sense of gratitude to Dr. Priva Davidar. Professor and Head. Department Of Ecology and Environmental Sciences, Pondicherry Ilniversity, Pondicherry,for her well t~meds u-g-g estions. constant co-operation and encouragement during thc course of study. 1 thank the staff members of Legume Entomology, Crop Protection Division, ICRISAT, and my spec~arle gards to Mr.Satish Chandra from who111I had learnt a lot of field techniques during the present investigation Fruitful discussions with my friends, Shreyas, Narendra. Karthik, Robin and Bharath has given me a good exposure to the research guidelines aid methodology, which helped me a lot during the prcscnt research work. 1 thank my parents and sister, for their moral support, co-operation and encouragement during my course of study. I wouldn't had completed the present work on time without the help of my collegues Ravi, Sri and Vijay at ICRISAT.
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