Studies on correlation co-efficient of larval population of Helicoverpa armigera in reference to weather parameters
Anil Kumar, MK Tripathi, Umesh Chandra and Ram veer
Chickpea, (Cicer arietinum L.) is an important pulse crop world-wide. There are many constraints in the production of the crop, of which pod borer, Helicoverpa armigera Hubner is the notorious one which causes both quantitative and qualitative loss. Therefore, an experiment was conducted during Rabi 2010-11 and 2011-12. The larval population was recorded at weekly interval from a vegetative stage to till maturity and meteorological data was collected from the department of meteorology during crop season The results of the investigation on larval population of pod borer (Helicoverpa armigera Hubner) in relation to abiotic factors revealed that the appearance from 46 standard week to till 14 standard week. The correlation co-efficient with the population of H. armigera was significantly positively correlated with minimum temperature (0.5463 during 2010-11 and 0.7998 during 2011-12) and maximum temperature (0.5202 during 2010-11 and 0.6339 during 2011-12) respectively. While relative humidity (-0.3536 during 2010-11 & -4191) and rainfall (-0.14966 during 2010-11 & 0.3343 during 2011-12) showed negative correlation.