. Insect pests and plant diseases : containing remedies and suggestions recommended for adoption by farmers, fruit-growers, and gardeners of the province . Pests; Fungal diseases of plants; Insect pests. 60 Vict. Provincial Board of Horticulture. 47 Fig. 1. Natural size. Fig. 2. SYRPHUS FLIES. Natural size. Sp. unnamed. Fig. 3. In the above cuts Fig. 1 represents the fly; Fig. 2, magnified, the case in which it transforms into a fly, and Fig. 3, magnified, the larva. The Syrphus Flies are also great destroyers of aphides. The larvae feed entirely upon aphides, and appear and disappear as the a
. Insect pests and plant diseases : containing remedies and suggestions recommended for adoption by farmers, fruit-growers, and gardeners of the province . Pests; Fungal diseases of plants; Insect pests. 60 Vict. Provincial Board of Horticulture. 47 Fig. 1. Natural size. Fig. 2. SYRPHUS FLIES. Natural size. Sp. unnamed. Fig. 3. In the above cuts Fig. 1 represents the fly; Fig. 2, magnified, the case in which it transforms into a fly, and Fig. 3, magnified, the larva. The Syrphus Flies are also great destroyers of aphides. The larvae feed entirely upon aphides, and appear and disappear as the aphides appear and disappear. The larva is a foot- less, eyeless, flattened, transversely wrinkled, gaily coloured, green and purple Syrphus Flies, maggot, having a very extensile body, which enables it to reach up and grasp the aphis with its peculiar looking mouth. The single egg, deposited in a group of aphides, hatches forty-eight hours after it is laid, and the larva becomes full-grown and transformed into a pupa in five or six days. The reason of this extremely rapid develop- ment in the first two stages, the egg and the larva, is explained when we consider how brief is the existence of the aphis, and how suddenly its colonies appear and disappear. When the larva is actively feeding it destroys dozens of aphides, one after the other, and its body changes colour. When filled to repletion the larva falls into a lethargy, lasting two or three hours, during which the process of digestion changes the juices of the body to varying shades of brown. After the process of digestion has taken place, the larva again begins its work devouring DEVIL'S HORSE or WHEEL BUG (Prionidus cristatus. Linn.) This insect feeds upon scales and aphides and destroys large numbers of caterpillars. The female deposits her eggs in a hexagonal mass on the leaves and bark of trees, on fence rails, etc. Generally, there are about seventy eggs in a bunch. The young are Wheel Bug. blood-red in colo
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectinsectpests, bookyear
