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Show CONTROL INSECTS IN THE ORCHARDS A drive dealing death to insects infesting in-festing South Dakota orchards Is advocated ad-vocated by G. T. Gilbertson, assistant state entomologist at state college. "The program of Insect prevention and control In orchards is logical," he claims, "because it is aimed at the beginning phase of later outbreaks. out-breaks. . Its cost Is offset by the resultant re-sultant increased yield and quality of the fruit." Insect prevention and control may be divided Into two divisions sprav-Ing sprav-Ing and cultural practices. The cultural cul-tural practices are weed destruction, removal of crop remnants, and prun-lngs. prun-lngs. Pruning should be practiced because be-cause It aids In Insect control through the elimination of diseased and Infested In-fested wood. Refuse, such as crop remnants and prunlngs, should be removed re-moved and burned, because In this material" insects peculiar to the crop often feed and multiply. Weeds should be destroyed. They furnish excellent ex-cellent hibernating quarters for some Insects, and they propagate other Insects, In-sects, all harmful to the orchard. "The second division of the spring care of orchards includes spraying schedules for the spring season," Gilbertson Gil-bertson says. "To spray at the correct cor-rect times, to use the proper form and strength of spray, and to make a thorough covering of the parts sprayed, are important points to remember. re-member. Threo sprays the dormant spray, the early spring spray, and the petal fall spray are known as the spring applications." The dormant spray, according to Gilbertson, is a strong spray used on the trees before the buds begin to swell. The commercial lime-sulphur liquid, which must be. diluted with eight to ten parts of water, is one of the best dormant sprays. It destroys scale insects, aphid eggs, etc. This same spray, but diluted at the rate of 1 gallons of lime-sulphur to 50 gallons of water, should be applied when the buds show pink, though before be-fore they burst. This is the early spring spray. If plant lice abound, black leaf 40 one-third of a pint to every 50 gallons of the diuted spray may be added.. A third spray, the petal fall spray, should follow when the petals have fallen away from the blossoms never while the trees are In full bloom. Lime-sulphur, diluted as In the early spring spray, is used. To this is added lead arsenate powder two pounds to every 50 gallons of diluted spray. |