. Injurious insects : how to recognize and control them . Insect pests; Insect pests. 202 PESTS OF GARDEX AXIi FIELD CROPS On beans they may be killed by spraj-ing -svith tobacco extract, or with 5 per cent kerosene emulsion. The Cabbage Aphis {Aphis bra-mca Linn.) Cabbage, cauliflower, and related plants are subject to infestation by a soft-bodied plant louse, which collects in masses on the surface of the leaves. The lice are green, but are covered with a whitish, powdery secretion. Winter is passed as eggs on old cab- bage stumps or heads in the field. There may be a dozen or more gen- erat
. Injurious insects : how to recognize and control them . Insect pests; Insect pests. 202 PESTS OF GARDEX AXIi FIELD CROPS On beans they may be killed by spraj-ing -svith tobacco extract, or with 5 per cent kerosene emulsion. The Cabbage Aphis {Aphis bra-mca Linn.) Cabbage, cauliflower, and related plants are subject to infestation by a soft-bodied plant louse, which collects in masses on the surface of the leaves. The lice are green, but are covered with a whitish, powdery secretion. Winter is passed as eggs on old cab- bage stumps or heads in the field. There may be a dozen or more gen- erations in a sum- mer. Spray thoroughly with tobacco extract to which soap has been added, or with 5 per cent kerosene emulsion, or with soap solution. 1 potmd in 3 gallons of water. Dip infested seedhngs in the same solution before setting out. Dispose of crop remnants. .Judicious rotation will help in delating attack. Wild mustard and shepherds-purse should not be allowed to grow near Tig . â "Work of the Cabbage Aphis. Origmal. The Potato Plant-louse (Maaosiphum â solanifolii Ashm.) In occasional seasons potato i.'ines are seriously checked in the latter part of smiuner by m>Tiads of green, soft-bodied plant lice, which suck the juices of leaf and stem. .Spra>'ing the fields with contact insecti- cides, either tobacco extract or o per cent kerosene emulsion, will kill the Uce. .'^ince the pest sur\'ives the winter on alternate host plants, es- pecially shepherds-purse, clean culture and burning over waste places. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original O'Kane, Walter Collins, b. 1877. New York : The Macmillan Company
Size: 1908px × 1310px
Photo credit: © Central Historic Books / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectinsectp, bookyear1912
