. Bulletin. Insects; Insect pests; Entomology; Insects; Insect pests; Entomology. LIFE HISTORY AND CONTROL OF HOP FLEA-BEETLE. 55 reach them. Painting the poles with crude oil or a thick crude-oil paint with the idea of blocking the beetles in was another suggestion, and several experiments were conducted along this line. Whiting was used as a filler and the poles were thoroughly coated with the mixture. This formed a sticky coating when first applied, but the oil was soon absorbed by the wood, and neither acted as a barricade nor a sticky trap for those that might crawl up the pole. At the ti
. Bulletin. Insects; Insect pests; Entomology; Insects; Insect pests; Entomology. LIFE HISTORY AND CONTROL OF HOP FLEA-BEETLE. 55 reach them. Painting the poles with crude oil or a thick crude-oil paint with the idea of blocking the beetles in was another suggestion, and several experiments were conducted along this line. Whiting was used as a filler and the poles were thoroughly coated with the mixture. This formed a sticky coating when first applied, but the oil was soon absorbed by the wood, and neither acted as a barricade nor a sticky trap for those that might crawl up the pole. At the time that the majority of the beetles were believed to be hibernating in the trellis poles, dipping them in hot crude oil was offered as a sure cure. This process, if properly handled, would probably de- stroy all the beetles that were in the poles, but the few present in that situation did not war- rant such expense. A fumigatorium (fig. 16) was made which could be placed around a trellis pole, and many fumigation exj^eri- ments were tried dur- ing the winter. When the thermometer was below 32° F. the bee- tles were apparently unaffected by the gases, and under field conditions the wind blew so hard that it was impossible to make the fumigatoi*- ium tight enough for effective work. Such a method, too, would require a great deal of time and labor, and as a practical control measure is out of the question. Several attempts were made to burn the beetles that were in the poles. In one experiment kerosene was painted on the wood and lighted, and in another an oiled gunny sack was lighted and wound around the base of a pole which was then inclosed in the fumigatorium. By the latter method a few beetles were killed, but as wood is such a poor conductor of heat few were heated sufficiently to injure them. Rolling the yards.—The fact that beetles were observed hibernating in the grass and just under the surface of the soil led to the sug- gestion that rolling the yards with a heavy ro
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