. Agricultural zoology. Zoology. INSECTS. 113 year. Since a considerable time elapses between the laying of the first and second batches of eggs, one usually sees eggs, larvae, pupae, and beetles at the same time. Entire potato fields are eaten bare by the beetles and their larvae, the formation of the potatoes being quite prevented. Remedies: Energetic measures must be taken on the first appearance of the beetle in any district. Where possible, all the beetles and larvae must be collected, the plants being dug up and destroyed with the beetles, pupae/ larvae, and eggs adhering to them. Petrol
. Agricultural zoology. Zoology. INSECTS. 113 year. Since a considerable time elapses between the laying of the first and second batches of eggs, one usually sees eggs, larvae, pupae, and beetles at the same time. Entire potato fields are eaten bare by the beetles and their larvae, the formation of the potatoes being quite prevented. Remedies: Energetic measures must be taken on the first appearance of the beetle in any district. Where possible, all the beetles and larvae must be collected, the plants being dug up and destroyed with the beetles, pupae/ larvae, and eggs adhering to them. Petroleum must then be poured over the whole field and set on fire, so as to destroy any insects which may be hidden in the soil. Spray- ing the attacked plants with Schweinfurt green. The Cloudy Tortoise Beetle {Cassida nebulosa)— Fig. 83. One-fifth to one-fourth of an inch long; the broad neck-shield projects in front over the small head. The wing-covers, too, are much broader than the body of the animal; they are longitudi- nally ribbed. Dorsal side reddish- brown,inyoung individuals greenish; always with black spots. Ventral side black. Larva elongated oval, yellowish green. Segments of the body beset with thorn-like struc- tures bearing lateral branches; the last segment possesses a " tail-fork," fig. as.—The cioudy which the larva usuaUy carries bent SSL'S^f ^''"' over its back and on which it heaps up its dung. The beetles which have survived the winter usually attack in spring only wild goose-foot and orach plants, on which they lay their eggs in heaps. The larvae quickly appear, and to begin with chiefly keep to the under sides of the leaves. They are sluggish, grow quickly, and devour the leaf substance; when fully developed they cement themselves to a leaf and become pupae. In June the beetles of the second generation appear, which again lay their eggs on the I. Please note that these images are extracted from scanned page images that may have been digit
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1894
