POPULATION DYNAMICS OF CEREAL APHIDS IN WHEAT CROP AT DISTRICT SWABI

Being serious threats to cereal crops, the estimation of aphid populationand its timely control is always a challenge for agriculture scientists. In order toevaluate population dynamics of aphid a survey was conducted in selected areasof district swabi. For population dynamics, number of aphids were recorded onweekly basis using diagonal methods by randomly selected 5 plants from eachfields. The findings of the study indicated that aphid attack started in the 1stweek of February and increased as the vegetative growth proceeded. Moreover,the aphid population was higher in the 2nd and 3rd week of March and decreasedsubsequently.