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G. molesta causes damage of varying importance on peaches, nectarines and apricots. The larvae of the first generation are mostly found in buds and shoots of peaches, but occasionally also on shoots of apricots, plums, almonds, cherries, apples, pears and quinces. In young trees when terminal twigs are attacked, several lateral shoots will appear below them and grow rapidly. Under severe and continued attack, the tree may become somewhat bushy. Severe attacks on the rapidly growing shoots of recently budded peaches result in crooked stems.
In harvested peaches there are two distinct types of injury. One is caused by larvae that have abandoned the twigs, feeding on, or entering into, the side of the fruit early in the season when the fruit is small. It is frequently called 'old injury'. The second type of damage is caused by entrance at the stem, called 'new injury', and occurs when the fruit is almost fully grown. This injury is caused by newly hatched larvae that go directly to the fruit. The surface indications of the presence of maggots in the fruit are frequently obscure and occasionally lacking, and only a small part of such injured fruit can be detected during grading. The loss sustained by growers from this type of injury is in reduced prices for their fruit (USDA, 1958). In France, this pattern of injury is characteristically seen on nectarines. On downy-skinned peaches, the reverse may be seen (early attacks at the stalk, later attacks at the side of the fruit). G. molesta damage also favours brown-rot infection (Monilinia spp.). Fruits of other species are also occasionally attacked in the vicinity of peach orchards.
Removing pruned material, as well as post-harvest fruits left on the tree and on the ground, can reduce the impact of G. molesta on orchards.
Due to the variable regulations around (de-)registration of pesticides, we are for the moment not including any specific chemical control recommendations. For further information, we recommend you visit the following resources: