Manual of vegetable-garden insects . d with a white waxy bloom sothat the spray does not readily wet them ; and they occur indense masses or colonies,and considerable force isrequired in order to reachthose beneath the commercial condi-tions, it is not possible todestroy all the lice byspraying. The best thatcan be expected is so toreduce their numbers thatthe plant will be able tocontinue its growth anddevelop the head. Efficientwork can be done by spray-ing with the so-calledwhale-oil or fish-oil soap,10 pounds in 100 gallonsof water, or with BlackLeaf 40 tobacco extract,f pint
Manual of vegetable-garden insects . d with a white waxy bloom sothat the spray does not readily wet them ; and they occur indense masses or colonies,and considerable force isrequired in order to reachthose beneath the commercial condi-tions, it is not possible todestroy all the lice byspraying. The best thatcan be expected is so toreduce their numbers thatthe plant will be able tocontinue its growth anddevelop the head. Efficientwork can be done by spray-ing with the so-calledwhale-oil or fish-oil soap,10 pounds in 100 gallonsof water, or with BlackLeaf 40 tobacco extract,f pint in 100 gallons ofwater with 4 or 5 poundsof soap added. The firstapplication should be madeas soon as the lice begin tocluster on the young least 100 gallons shouldbe applied to each acrewhen the plants are young. The most effective and economicalmethod of application is to use an ordinary potato sprayer(Fig. 24) equipped with a Y to which are attached two leadsof hose 10 or 12 feet in length. At the end of each hose is an. Fig. — A radish seed-stalk infestedby the cabbage aphis (enlarged). 26 MANUAL OF VEGETABLE-GARDEN INSECTS extension rod about 20 inches long, furnished with a Bordeauxor Vermorel nozzle, preferably the former. The pump shouldbe able to maintain a pressure of at least 125 pounds. Withthis arrangement three men are needed, one to drive the horseand two to carry the nozzles. Attempts to use a potatospra>er with fixed nozzles have been unsuccessful. A stiff
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Keywords: ., bookcentury1900, bookdecade1910, bookpublishernewyo, bookyear1918
