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在自然或半控制的情况下观察水稻三化螟的繁殖力及存活率,对发生数量、为害程度的预测很有参考价值。我们在这方面进行了长期观察,有几种方法比较简便,介绍如下: 一、产卵量的观察 经过多次试验,我们认为在田间禾蔸罩纱笼(尼龙纱网或蚊帐布比钱纱网好),接入未产卵雌蛾,比盆栽接种好。纱笼过大,查卵易漏计;过小则妨碍螟蛾活动产卵,以70厘米见方、高1米、无底板、高出禾尾4-5
Observed in the case of natural or semi-controlled rice borer Borer’s fecundity and survival rate, the occurrence of the number of damage degree of great reference value. We have conducted long-term observations in this area. There are a few methods that are relatively simple and can be described as follows: 1. Observation of the fecundity After several trials, we think that in the field Wo straw veil (nylon gauze or mosquito net cloth than money gauze net Good), access females did not oviposit, better than potted inoculation. Sarong too large, eggs easy to leak meter; too small is to interfere with the activities of the moth moth spawning to 70 cm square, 1 meter high, no floor, above the tail 4-5