Abstract
An attempt has been made to quantify the effect of weather parameters and ladybird beetle on population fluctuation of aphid using path analysis of data collected during rabi 2012-13 and 2013-14 at Junagadh Agricultural University, Junagadh. The result revealed that the direct effect of minimum and maximum temperatures on aphid population was negative and low (-0.4939 and -0.2628, respectively) while it was positive and moderate (0.5443) by mean temperature. The direct effect of morning relative humidity was positive and very high (1.8615), while mean relative humidity exhibited negatively very high direct effect (-3.3158) on aphid population. Residual value indicated that all these biotic and abiotic factors had a total combined effect of 86.01 per cent on population build-up of mustard aphid. It indicated that only 13.99 per cent effect was through other unknown factors existing in the ecosystem during bothseasons.
Highlights
Mustard is an important oilseed crop which constitutes as a major source of edible oil
Indirect effects of both these parameters were found to have negative low to moderate on aphid population through almost all other biotic and abiotic factors except mean relative humidity
2329) with aphid population had a moderate direct effect (0.9578) on aphid population, indicating an favorable individual influence on the population build-up of aphid. Indirect effects of both these parameters were found to have negative low to moderate on aphid population through almost all other biotic and abiotic factors except morning and mean relative humidity
Summary
Mustard is an important oilseed crop which constitutes as a major source of edible oil. Biotic and abiotic parameters play a vital role in population build-up of insect pest. Combined as well as individual effect of biotic and abiotic parameters on population fluctuation of the pest can be measured through path coefficient analysis. It gives direct influence of particular parameter on pest population build-up as well as its indirect effect through other parameters. In the present study the efforts has been made to study the direct and indirect effect of various biotic and abiotic parameters on population build-up of mustard aphid
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