Tests during the summer of 1930 with pyrethrum sprays and dusts, nicotine sprays and dusts, white oil sprays of four viscosities, these same four white oils impregnated with copper oleate, a sulfonated oxidized oil and Bordeaux sprays showed that all the sprays were effective in killing leafhoppers on asters and dahlias except the Bordeaux sprays, that the Bordeaux sprays and the pyrethrum dusts were the 1Paper of the Journal Series, New Jersey Agricultural Experiment Station, Department of Entomology. only materials tested which acted as repellents to the leafhoppers, and that all the sprays were safe upon the plants with repeated applications except the white oil sprays which, when used alone and impregnated with copper oleate, caused burning to the foliage of asters. Tests conducted during the summer of 1931 with pyrethrum sprays and dusts and Bordeaux sprays showed that heavy applications of Bordeaux sprays or of a pyrethrum dust applied dry or as a wet wash were effective in repelling the green apple leafhopper (Empoasca mali) for a period of four to five days. Nicotine dusts were of only slight value in repelling the leafhoppers. Six foot cheesecloth cages constructed around groups of plants supplemented with an occasional dusting with pyrethrum gave the best control of leafhoppers. The leafhopper population in the treated plots was reduced to zero at each treatment but was built up almost to that of check plots within five days due to migration of the leafhoppers from outside sources.
Document Type: Research Article
Publication date: April 1, 1932
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