Karban R
Department of Entomology, University of California, 95616, Davis, CA, USA.
Oecologia. 1987 Sep;73(3):414-419. doi: 10.1007/BF00385258.
Spider mites (Tetranychus urticae) were raised on cotton plants that had been damaged by a previous bout of mite feeding (T. turkestani) and on control plants that were previously not exposed to mites. The effect of induced plant responses upon mite populations was variable ranging from a 4-fold reduction in population growth to no difference at all. The strength of induced resistance was greatest when the population growth of mites was low for other, unknown, reasons. When mite population growth on control plants was great, the effects of induced resistance were diminished.Mite population growth was inversely related to levels of initial damage caused by previous feeding. There was no evidence of a damage threshold that needed to be exceeded before induced resistance became effective. Increased levels of initial damage were not associated with morphological changes in the plants.
叶螨（土耳其斯坦叶螨）饲养在先前受到另一批叶螨（土耳其斯坦叶螨）取食损害的棉花植株上，以及先前未接触过叶螨的对照植株上。诱导的植物反应对叶螨种群的影响各不相同，从种群增长降低4倍到完全没有差异。当由于其他未知原因叶螨种群增长较低时，诱导抗性的强度最大。当对照植株上的叶螨种群增长很大时，诱导抗性的效果就会减弱。叶螨种群增长与先前取食造成的初始损害水平呈负相关。没有证据表明在诱导抗性生效之前需要超过某个损害阈值。初始损害水平的增加与植物的形态变化无关。
