This experiment was carried out to determine the treatment interval on neem product for control of Bemisia tabaci on eggplant using eco-friendly agriculture. We have investigated the control effect of B. tabaci, growth characteristics of eggplant, economics according to neem product treatment interval on eggplant. The longer neem processing interval tended to decrease control effect on nymphs of B. tabaci. Control effect of nymph of B. tabaci according to treatment interval of 3 days, 5 days, 7 days, 10 days, and 15 days were 96.7%, 89.7%, 76.1%, 73.4%, and 51.0%, respectively. This result was the same tendency in adult of B. tabaci control effects on eggplant. Growth characteristics of eggplant according to neem the treatment interval of 3 days, 5 days, and 7 days, was less damaged on of B. tabaci. However, the 10 days, 15 days, and untreated of neem treatment intervals were badly damaged by B. tabaci. Therefore, neem treatment interval of 3~7 days for control of B. tabaci was high control effect. However, it is considered to be the most suitable to process every seven days considering the economics and so on. The results of economic analysis from income of 7 days neem treatment interval was the most high as 19.505 thousand won per 10a and the most economical treatment for control of B. tabaci.

Neem제를 이용한 가지 담배가루이 친환경 방제기술을 개발하고자 azadirachtin 0.5%가 함유된 Neem제를 100~2,000배까지 희석배수 5처리를 두고, 담배가루이 방제효과와 가지 생육과 수량을 조사하였으며, 경제성을 분석하였다. 담배가루이 성충과 약충의 발생상황은 Neem제 희석배수가 높아질수록 성충과 약충의 발생량이 증가하여 방제효과가 낮았다. Neem제 처리농도별 가지 생육상황은 낮은 희석배수에서는 약해가 발생하였고, 높은 희석배수에서는 담배가루이에 의한 피해가 나타났다. 생육 및 수량은 48일후 조사에서 500배가 초장, 엽장, 절수 등 생육이 양호하였다. 또한 Neem제 500배 처리에서 과실의 발육이 좋아 수량성 및 상품률도 가장 높았다. 경제성 분석결과에서도 Neem제 500배 처리에서 10a당 13,545천원으로 소득이 가장 높았다. 따라서 담배가루이 방제를 위한 Neem제 희석배수는 500배였다.