苹果树上红蜘蛛爆发了,什么药剂特效

2025年04月06日 16:59
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别名苹果红蜘蛛。

【危害症状】:同山楂叶螨。叶片受害初期出现失绿小斑点,以后许多斑点连成斑块。在叶片上有许多螨蜕,并有丝网。受害严重的叶片枯焦,似火烧状,提前落叶。

【生活习性】:北方果区年生6-9代,以卵在短果枝果台和二年生以上的枝条的粗糙处越冬,越冬卵的孵化期与苹果的物候期及气温有较稳定的相关性,一般在日平均气温12.3-14.7℃开始孵化,苹果花蕾膨大时,气温达14.5℃进入孵化盛期,越冬卵孵化十分集中,所以越冬代成虫的发生也极为整齐。第一代夏卵在苹果盛花期始见,花后一周大部分孵化,此后同一世代各虫态并存而且世代重叠。7-8月进入为害盛期,8月下旬-9月上旬出现冬卵,9月中下旬进入高峰,幼螨,若螨,雄螨多在叶背取食活动,雌螨多在叶面活动为害,无吐丝拉网习性,既能两性生殖,也能孤雌生殖,完成l代平均为10-14天。每雌产卵量取决于不同的世代,越冬代每雌产卵67.4粒,日均产卵4.5粒。第5代则产11.2粒,日均产卵1.9粒,夏卵多产在叶背主脉附近和近叶柄处,以及叶面主脉凹陷处。天敌与山楂叶螨相似。

【防治方法】:(1)保护和引放天敌。(2)尽量减少杀虫剂的使用次数或使用不杀伤天敌的药剂以保护天敌,特别花后大量天敌相继上树,如不喷药杀伤,往往可把害螨控制在经济允许水平以下,个别树严重,平均每叶达5头时应进行挑治,防止普治大量杀伤天敌。(3)果树休眠期刮除老皮,重点是刮除主枝分叉以上老皮,主干可不刮皮以保护主干上越冬的天敌。药物防治用哒螨灵1000倍,阿维菌素2000倍喷雾防治

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