所谓中期预测，其预测期限一般为２０ｄ到一个季度，常在一个月以上，通常是预测下一个世代的发生情况。所谓长期预测，其预测期限常在一个季度以上，通常是根据越冬后或年初某种害虫的越冬有效虫口基数及气象预报资料作出，于年初展望其全年发生动态和灾害程度。所谓生命表， The so-called medium-term forecast, the forecast period is generally 20d to a quarter, often more than a month, usually to predict the next generation of the situation. The so-called long-term prediction, the forecast period of more than one quarter often, usually based on overwintering winter or early pest overwintering effective insect population base and weather forecast data, at the beginning of the year to look forward to its annual dynamics and disasters. The so-called life table,