Insects and insecticidesA practical manual concerning noxious insects and the methods of preventing their injuries . Fig. 108. Cabbage Apbis: male, magnified. viviparously, but in autumn true males (Fig. 108)and females (Fig. 107) are developed, eggs beingdeposited by the latter upon the cabbage leaves. Remedies.—Kerosene emulsion is the most effec-tive insecticide that can be used against this insect. 202 INSECTS AFFECTING THE CABBAGE. It may readily be applied to cabbage from a knap-sack sprayer, like the one manufactured by the FieldForce Pump Company, or the Excelsior the insect
Insects and insecticidesA practical manual concerning noxious insects and the methods of preventing their injuries . Fig. 108. Cabbage Apbis: male, magnified. viviparously, but in autumn true males (Fig. 108)and females (Fig. 107) are developed, eggs beingdeposited by the latter upon the cabbage leaves. Remedies.—Kerosene emulsion is the most effec-tive insecticide that can be used against this insect. 202 INSECTS AFFECTING THE CABBAGE. It may readily be applied to cabbage from a knap-sack sprayer, like the one manufactured by the FieldForce Pump Company, or the Excelsior the insect winters over in the egg state upon thecabbage leaves, it is advisable to destroy all the re-mains of the crop in autumn, not leaving the be-headed plants in the field all winter, as is too INSECTS AFFECTING THE ONION. INJURING THE BULBS. The Onion Maggot. Anthomyia ceparum, The Onion Maggot is closely related to the CabbageMaggot, to which it is similar in life-history andhabits. The adult is a two-winged fly, which depositsits small, white eggs on the bulbs or lower leaves ofthe young plants. About a week later the eggshatch into young larvas that bore into the bulbs, ab-sorbing the succulent substance. When one bulb isconsumed they pass on to another. The full-grownlarvas are nearly half an inch long, of a dull whitecolor, and pointed at the mouth or front end. Theycomplete their larval growth in about two weeks, andthen leave the onions and enter the surrounding-earth, where they change to the pupa state withinbrown puparia. A fortnight later the flies emerge tolay eggs for another brood. Remedies.—Professor Cook states that the mostpractical method of preventing the injuries of thisinsect is to change the position of the onion bedevery year, putting it each time s
Size: 1465px × 1705px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, bookidi, booksubjectinsecticides
