The American florist : a weekly journal for the trade . h full size, theyare hard to destroy. As a preventive,greenhouses should be fumigated onceor twice a week if insects are foundtroublesome. Kerosene emulsion andwhale oil soap are also quite effective. White flies.—Closely related to theaphides are the aleyrodes or white flies,as they arc generally called, whichsometimes appear in large numbers inthe greenhouse and do considerable in-jury. They are very small incests, hav-ing a wing expanse of about one-eighthof an inch. Both sexes are wings are white, sometimes spot-ted ; the b
The American florist : a weekly journal for the trade . h full size, theyare hard to destroy. As a preventive,greenhouses should be fumigated onceor twice a week if insects are foundtroublesome. Kerosene emulsion andwhale oil soap are also quite effective. White flies.—Closely related to theaphides are the aleyrodes or white flies,as they arc generally called, whichsometimes appear in large numbers inthe greenhouse and do considerable in-jury. They are very small incests, hav-ing a wing expanse of about one-eighthof an inch. Both sexes are wings are white, sometimes spot-ted ; the body is pink or yellowish, withmore or less black spots. Both thewings and body are covered with a finewhite powder. This is found onthe imderside of the leaves of manygreenhouse plants, but is especially de-structive on tomatoes, melon, cucum-bers and hibiscus. Remedies: Many remedies have beentried for this pest. Fumigating with to-bacco is not an effective remedy. Hy-drocyanic gas has been found to be ef-fective, but requires to be used with. LILIUM LONGIFLORUM caution, as, if used too strong or left inthe house too long, it will seriously in-jure the plants. Good results have beenobtained by using I ounce of cyanide toevery 400 cubic feet of space and keep-ing the liouse closed nine the under surfaces of theleaves with common laundry soap andwater (one pound dissolved in eightgallons) has also been found to be acheap and effective remedy. Greenhouse leaf-tyer (Phlyctaeniaferrugalis).—They are slender leaf-eat-ing caterpillars; when full grown aboutthree-quarters of an inch in length, andof a semi-translucent green, with a darkgreen dorsal stripe, on each side ofwhich is a sub-dorsal wdiite band. Theadult is a small brownish moth. From the time they hatch until full grown, thecaterpillars live in tents made by draw-ing down the leaflets of the leaves. Thecocoons aie spun between the feed on the parenchyma of theunderside of
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectfloriculture, bookyea
