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The leaf-rollers which damage the plum tree in Moldavia and the effect of chemical treatments, on fruit mites in the- control of leaf-rollers

The leaf-rollers which damage the plum tree in Moldavia and the effect of chemical treatments, on fruit mites in the- control of leaf-rollers

Sb Tr Mold St Vses Inst Zashchity Rast (2): 115-120

The plum leaf-roller moth has 2 generations in Moldavia. Damage is different in various years because the plum trees do not bear fruit each year and because of the spatial isolation of the plum plantings. When the latter adjoin apple tree gardens, the fruit of the plum trees, especially of the late varieties, is considerably damaged by the 2nd generation of the lesser apple worm. The plums, when isolated from the apple trees, are barely infested. Spraying with a 0.3% (active) DDT emulsion 3 times decreased the damage from the leaf-roller moths, but caused increase of the brown and especially the hawthorn mites, which led to scalding of the leaves by the emulsion and their premature falling off; it also decreased the weight, size and sweetness of the fruit. It is expedient to test a DDT suspension with the addition of 0.03% thiophos (active) parathion which is toxic for the larvae and moths of the leaf-rollers, for the moving varieties of fruit mites, the larvae of Parthe-nolecanium corni Bouche and of aphids.

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