. Cooperative economic insect report. Insect pests Control United States Periodicals. - 234 - Spring Potato Psyllid Survey - 1957: A survey made March 12 to 21 showed very high potato psyllid (Paratrioza cockerelli) populations occurring on wild host plants in the spring breeding areas in the Southwestern States. They were particularly high in areas east of the Rocky Mountains, which is the source of psyllids that later move into the summer breeding areas east of the mountains in Colorado, Wyoming and Nebraska. Populations at Big Spring, Texas, averaged 516 per 100 sweeps, which is the largest
. Cooperative economic insect report. Insect pests Control United States Periodicals. - 234 - Spring Potato Psyllid Survey - 1957: A survey made March 12 to 21 showed very high potato psyllid (Paratrioza cockerelli) populations occurring on wild host plants in the spring breeding areas in the Southwestern States. They were particularly high in areas east of the Rocky Mountains, which is the source of psyllids that later move into the summer breeding areas east of the mountains in Colorado, Wyoming and Nebraska. Populations at Big Spring, Texas, averaged 516 per 100 sweeps, which is the largest number ever recorded for this area. Also at San Angelo current checks showed an average population of 184. This is the largest number recorded for that area. A population of 17 at Del Rio indicated that psyllids were moving out of this over- wintering area to areas further north and west. Record high numbers of 129 and 158 were found at Marathon and El Paso, Texas, respec- tively. West of the mountains in central Arizona and southern California high population averages of 95 and 143 respectively were found. Very large numbers of eggs were observed on the host plants in the central Arizona area. These high psyllid populations indicate the likelihood of large northward move- ment during May and June into the potato and tomato growing areas of Colorado, Utah, Wyoming, and Nebraska, if favorable weather Figures = average number of psyllids conditions occur at the time of the per 100 sweeps movement. (PPC, ENT and Coop. States). ONIOK PLANT BUG (Labopidea allii) - TEXAS - Light to medium infestation in one onion field in Montgomery County (Davis) and light in Brazos County (Garner). ONION THRIPS (Thrips tabaci) - TEXAS - Light to heavy infestation on untreated onions in Winter Garden area. (Richardson). Light on garden onions in Brazos County. (Garner). SWEETPOTATO WEEVIL (Cylas formicarius elegantulus) - LOUISIANA - Reinfestations found in Winn Parish"! GEORGIA - Planting res
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