OCR Text |
Show Com Worm Control Outlined "Coin carworm control soon will be noccs.sary If commercial and home growers are to save this crop from Injury due to this serious Insect pest," declares Dr. O. F. Knowlton, extension entomologist en-tomologist at the Utah State Agricultural college. Three methods of control are available to growers of sweet-corn: sweet-corn: 1. Oil treatment. Use a white mineral oil containing 0.2 per cent of pyrethrlns. Apply the oil after the silks are wilted, when their tips have begun to turn brown. Use an oil can calibrated cali-brated to deliver one-fourth teaspoonful, or an ordinary medicine med-icine dropper one that when half full will hold 20 drops. Never iwe large amounts. The oll-pyrethrin, Injected Into the silk mass of the ear, penetrates quickly and kills worms feeding there. 2. Clip the silk near the tip of the ear and burn so as to destroy de-stroy eggs and worms. Fertilization Fertili-zation takes place within 4 or 5 days after the corn silk comes out and clipping should take place on the fifth or sixth day. If delayed too long, the worm will have reached the ear. 3. Poison the worm while on the silk. This may be done by dusting the silk with a mixture consisting of 1 part colcium arsenate mixed with 3 parts dusting sulfur. Such dust should be applied within 3 or 4 days after the silk appears. Dr. Knowlton suggests that if the oil-pyrethrin treatment is selected, the grower should start using it on a small scale until experience in its use is obtained. Too early application of the oil, before pallination is completed would stop pollination and poor ears would result. With experience, exper-ience, this first method is proving prov-ing popular and profitable with sweet corn growers in many j pan;; of this country- - |