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PRINT ISSN : 2319-7692
Online ISSN : 2319-7706 Issues : 12 per year Publisher : Excellent Publishers Email : editorijcmas@gmail.com / submit@ijcmas.com Editor-in-chief: Dr.M.Prakash Index Copernicus ICV 2018: 95.39 NAAS RATING 2020: 5.38 |
The Path analysis of certain climatic factors affects the population of American Bollworm (ABW), Helicoverpa armigera (Hubner) Lepidoptera -Noctuidae in Cotton was assessed at the Jawharlal Nehru Krishi Vishwa Vidhyalaya, Cotton Research Station, Khandwa M.P. The perusal of data on the population of American bollworm, Helicoverpa armigera revealed that the American bollworm, Helicoverpa armigera larvae was first observed during the 29th SMW i.e. III week of July. The population of ABW larvae showed increasing trend between 29th to 36th SMW and attained peak (24.01 larvae) during 36th SMW i.e. IInd week of September and remained active up to 1st SMW i.e. Ist eek of January. The weather condition prevailed during peak population of ABW larvae viz. maximum temperature, minimum temperature, morning relative humidity, evening relative humidity, sunshine hours, wind velocity, rainfall and rainy day were 34.60°C, 26.15°C, 80.97 %, 50.65%, 8.38 hours per day, 4.80 kmph, 21.50 mm and 1.50 days respectively. The correlation studies between ABW population and weather factors revealed that the ABW larva population had a significant positive correlation with maximum temperature and minimum temperature. The multiple coefficient value between the ABW population and group of variable clearly indicated that 51.70% change in ABW population were affected by maximum temperature, minimum temperature, morning relative humidity, evening relative humidity, sunshine hours, wind velocity, rainfall and rainy days respectively. The Path coefficient analysis of different factors revealed that minimum temperature had positive and high direct effect followed by morning relative humidity, sunshine hours and evening relative humidity respectively. The further revealed that the positive indirect effect of high magnitude of minimum temperature was obtained via, sun shine hours and evening relative humidity respectively. Positive indirect effect of morning relative humidity was obtained via wind velocity, evening relative humidity, sunshine hours and maximum temperature. Positive indirect effect of sunshine hours was obtained via minimum temperature, rainfall, rainy days and morning relative humidity. Positive indirect effect of evening relative humidity was obtained via morning relative humidity and minimum temperature.
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