Studies in Hemiptera - Softcover

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1922 Excerpt: ...waste placed in the net will absorb the oil and in rolling around will thoroughly wet the bugs. Two men will be required to manipulate the net and at least another to shake the branches. "For large trees these nets will be found more economical than the smaller ones strung on telephone wire. They are effective, however, only at a temperature below 70 degrees. Above that the bugs will take to wing as they drop, before they strike the canvas. The use of the large nets is therefore restricted to the very early morning, to moonlight nights and to cold days. The smaller nets can be used all day, though more effectively in the early morning." Spraying Both Watson (1918a, p. R59-R62) and Jones (1918, p. 23-25) have demonstrated that it is not practical to use contact insecticides as a solution strong enough to kill the insect will injure or destroy the plants. Experiments with kerosene emulsion and nicotine sulphate gave negative results. A solution that will not injure the foliage of plants will not destroy all of the younger nymphs and has very little or no effect upon the larger nymphs and adults. Nymphs and adults are both quickly killed when sprayed with pure kerosene. Badly infested weeds and remnants of cultivated plants should be destroyed, either by cutting or spraying. If the insects are mostly in the adult state, the latter method should be used. Summary A large green stink-bug, Nezara viridula Linn., often becomes a serious pest upon cultivated plants in Florida. Its depredations are also well known in other southern states, but particularly in the Gulf States. The insect is of foreign origin and is almost universally distributed throughout the tropical and neotropical regions of the entire world. Its ravages have also been reported in Austra...