论文部分内容阅读
苹果园红蜘蛛发生猖獗的主要原因有以下几个方面。 1.红蜘蛛繁殖力强,发育速度快,对环境条件适应性强,这是其内部因素。 2.夏季高温干旱能促使红蜘蛛迅速增殖。在5月份繁殖一代需要一个月,6～8月份只需15天,而且产卵量多,孵化率高,虫口增殖快。 3.天敌减少,造成红蜘蛛成灾。在自然条件下,天敌(小黑瓢虫、六点蓟马、草蜻蛉等)能控制红蜘蛛的发生。在用药少的果园中天敌多,红蜘蛛不易成灾;反之,
Apple spider red spiders rampant mainly due to the following aspects. 1. Red spider fertility, rapid development, adaptability to environmental conditions, which is its internal factors. 2. Summer heat and drought can promote spider mite rapid proliferation. It takes a month to breed a generation in May, just 15 days from June to August, and the number of spawning, hatching rate is high, insect population proliferation faster. 3. Natural enemies reduce, causing red spider disaster. In natural conditions, natural enemies (black ladybugs, six o’clock thrips, lacewing, etc.) can control the occurrence of spider mites. In the medication less orchard more natural enemies, red spider is not easy to disaster; the other hand,