Insects injurious to fruits . ouixlin August and September, it has been suggested to sprinklethe ground about the vines at this period with quicklime,ashes, sulphur, salt, or other substances destructive to insectlife. The application of fertilizers rich in potash and ammo-nia, such as ashes mixed with stable-manure or sal ammo-niac, has been found useful. A simple remedy for the gall-inhabiting type is to pluck the leaves as soon as the gallsappear and destroy them. Several species of predaceous insects prey on this black species of Thrips with white-fringed wings {Thripsphylloxerae R
Insects injurious to fruits . ouixlin August and September, it has been suggested to sprinklethe ground about the vines at this period with quicklime,ashes, sulphur, salt, or other substances destructive to insectlife. The application of fertilizers rich in potash and ammo-nia, such as ashes mixed with stable-manure or sal ammo-niac, has been found useful. A simple remedy for the gall-inhabiting type is to pluck the leaves as soon as the gallsappear and destroy them. Several species of predaceous insects prey on this black species of Thrips with white-fringed wings {Thripsphylloxerae Riley, see Fig. 244) deposits its eggs within the gall, which when hatchedproduce larvae of a blood-red color, which play sadhavoc among the larva of a Syrphusfly, Pipiza radicum, whichfeeds on the root-louse ofthe apple (see Fig. 2), hasalso been found attackingthe Phylloxera. Anotheruseful friend is a small mite {Tyroglyphus phylloxerse P. &R., see Fig. 245), which devours the lice; and associated with Fig. ATTACKING THE ROOTS. 239 b this is sometimes found another species {Hoplophora arotataRiley) of a very curious form, reminding one of a 246 represents this insect in different attitinles, highlymao;nified. The gall-inhabiting type is very subject to the attacks of asmall two-winged fly, Diplosis grassator Fyles, which dejjosits Fig. l4.).
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Keywords: ., bookcentury1900, bookdecade1900, bookidin, booksubjectinsectpests
