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Image showing drab colouration of the adult Tachinid fly.. Because tachinid flies do not kill the host until after the caterpillar has finished feeding, helicoverpa crop damage is not prevented... The tachinid fly Goniophthalmus australis lays microscopic eggs (measuring 0.2 mm each) onto the plant surface close to where a helicoverpa caterpillar is feeding so that the caterpillar eats the eggs and becomes a host...
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