HOW LARVAE OF THRIPS-TABACI REDUCE THE ATTACK SUCCESS OF PHYTOSEIID PREDATORS
HOW LARVAE OF THRIPS-TABACI REDUCE THE ATTACK SUCCESS OF PHYTOSEIID PREDATORS
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DOI：
10.1007/bf00190128
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发表时间：
1989-01-01
影响因子：
1.9
通讯作者：
SABELIS, MW
中科院分区：
文献类型：
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作者：
BAKKER, FM;SABELIS, MW
在温室作物中使用巴氏新绥螨（=麦氏钝绥螨）和黄瓜钝绥螨（蜱螨目：植物绥螨科）作为烟草蓟马（昆虫目：蓟马科）的防治剂。它们在捕获幼虫阶段的成功与捕食者的摄食状态和幼虫的大小有关。当饥饿时，捕食者更容易捕获幼虫。在与饥饿的捕食者接触后，第二阶段的猎物幼虫比第一阶段的幼虫死亡的风险要低。烟粉虱的幼虫通过猛拉腹部和分泌一滴直肠液体来降低捕食者的攻击成功率。当用二氧化碳麻醉幼虫来防止这种防御行为时，捕食者的攻击成功率就会增加。然而，麻醉并不能消除两个幼虫阶段的死亡风险差异。讨论了造成这种差异的可能原因。合适猎物的可得性取决于猎物种群年龄结构的动态变化，因此，可能比总蓟马密度所显示的要低。如果是这样，替代食物来源可能对维持捕食者的数量很重要。
Neoseiulus barkeri (= Amblyseius mckenziei) and Amblyseius cucumeris (Acari:Phytoseiidae) are used as control agents of Thrips tabaci (Insecta:Thripidae) in greenhouse crops. Their success in capturing prey larval stages is related to both the feeding state of the predators and to the size of the larvae. When starved, predators are more successful in seizing larvae. Upon contact with a starved predator second stage prey larvae incur a lower death risk than first stage larvae. The larvae of T. tabaci reduce the attack success of their predators by jerking the abdomen and by producing a drop of rectal fluid. When this defensive behaviour is prevented by anaesthetising the larvae with CO2, predator attack success increases. Anaesthesia does not, however, level out the difference in death risk of the two larval stages. Conceivable causes for this discrepancy are discussed. Availability of suitable prey is dependent on the dynamics of the age structure of the prey population and, hence, may be lower than total thrips density suggests. If so, alternative food sources may be important to maintain the predator population.