. Biennial report. Insects, Injurious and beneficial. [from old catalog]. 1914.] State Crop Pest Commission. 117 trees. These habitually attend plant-lice of all kinds and feed on a sweet substance called honey-dew, secreted by them. Prevention and Treatment. Prevention of attack by aphids is rather more simple than treat- ment. The method is to defer the San Jose scale or dormant spray until as near the end of the dormant season as safety will permit, and then to use the standard lime sulphur wash at the strength ordinarily employed for scale. This has been found to kill a large percentage of
. Biennial report. Insects, Injurious and beneficial. [from old catalog]. 1914.] State Crop Pest Commission. 117 trees. These habitually attend plant-lice of all kinds and feed on a sweet substance called honey-dew, secreted by them. Prevention and Treatment. Prevention of attack by aphids is rather more simple than treat- ment. The method is to defer the San Jose scale or dormant spray until as near the end of the dormant season as safety will permit, and then to use the standard lime sulphur wash at the strength ordinarily employed for scale. This has been found to kill a large percentage of the winter eggs. Any young which may have hatched prematurely are all the more easily killed. It is necessary to be thorough in this work and to take special care to cover the tips of the twigs and branches. When the dormant spray is neglected or proves to be ineffective, it often becomes necessary to spray after the foliage is out. If this treatment is to be of any value it must be applied before the leaves are badly curled, otherwise it will be almost impossible to reach the aphids. and as they do nothing but suck the juices of the tree, they are not to be killed except by -A characteristic colony of apple-aphis on the under side of a leaf. After Sanderson. The best materials for this treatment are tobacco docoction—either home-made or commercial, with convenience inclining one toward the commercial material and economy perhaps suggesting the former—and kerosene emulsion, which though less convenient is quite effective and has the advantage of being always immediately available. No matter what material is used in this treatment it will be neces- sary to have good pressure and to have nozzles so arranged that the under sides of the leaves can be reached. It has been stated upon good authority that if tobacco extract be used it may be included in the regular sprays applied about the time the leaves unfold (the "cluster-cup" spray) thus avoiding the labo
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectinsects, bookyear1914
