| OCR Text |
Show Dust, Spray Halts Bean Leaf Hopper Copper Compound Is Found Good Protection If Applied Early. By L. H. Shropshire, Assistant Entomologist. Illinois State Natural History Survey. WNU Service. It is too early In the season to determine de-termine whether bean leaf hoppers will be plentiful enough to cause serious damage to the bean crop this year. However, the hoppers frequently reduce re-duce the crop by 50 per cent, and adequate ade-quate preparations for dusting or spraying the beans with a copper compound com-pound will be good crop insurance. Unprotected beans yielded f0 per cent less than those that had been sprayed or dusted in tests conducted at the Cook county branch experiment station of the College of Agriculture, University of Illinois. A copper dust containing tobacco and gypsum is one of the dusts ;ud sprays that has proved effective iu controlling con-trolling the leaf hopper during the tests. It was applied at the rate of about 20 to 25 pounds to the acre. Applications Ap-plications were made Ave times, beginning begin-ning as soon as the plants were well above the ground and continuing until five applications were made. The 3-G-50 Bordeaux spray also proved effective, but was not qv.it,- as good as the dust. Nicotine sulphite spray had little value in controlling leaf hoppers. Bean leaf hoppers do not hibernate in the garden regions of Illinois, but taigrate to the beans late in the season. They constitute one of the worst enemies en-emies of beans and frequently infest gardens In heavy numbers. |
