. Cooperative economic insect report. Insect pests Control United States Periodicals. - 753 -. SPOTTED ALFALFA APHID - UTAH - Built up in additional part of southwestern area. (Knowlton). ARIZONA - Damaging number alfalfa fields in Maricopa, Pinal, Pima, Cochise and Graham Counties, especially water-stressed fields. Severe damage one seed field Kansas Settlement, Cochise County. (Ariz. Coop. Rept. ). NEW MEXICO - Populations fluctuating. Sudden increase noted past two weeks in most fields. Moderate to severe damage spotty over most of southern half of State. Light to medium infestations in all
. Cooperative economic insect report. Insect pests Control United States Periodicals. - 753 -. SPOTTED ALFALFA APHID - UTAH - Built up in additional part of southwestern area. (Knowlton). ARIZONA - Damaging number alfalfa fields in Maricopa, Pinal, Pima, Cochise and Graham Counties, especially water-stressed fields. Severe damage one seed field Kansas Settlement, Cochise County. (Ariz. Coop. Rept. ). NEW MEXICO - Populations fluctuating. Sudden increase noted past two weeks in most fields. Moderate to severe damage spotty over most of southern half of State. Light to medium infestations in all fields but beneficials keeping them under control. Heavy build-ups in most fields of De Baca, Valencia and Sandoval Counties. Populations suddenly dissappeared this period in 1955, suspected correlation with July rains, however state received rains this week and populations have not decreased yet. (Durkin, July 21). TEXAS - Light populations on alfalfa in Brazos and Burleson Counties. (Randolph). KANSAS - Non-economic infestations continue in Osborne, Mitchell, Cloud, Clay and Riley Counties. Counts averaged approximately 250 per 25 sweeps. (Matthew). Aphids numbering 5, 000 per 25 sweeps in some alfalfa fields near Hays, Ellis County. (Harvey). OKLAHOMA - Populations low in all fields; counts from 1 to 40 per sweep in western and southwestern counties. (Coppock). COLORADO - Increased in Otero, Crowley and Montezuma Counties. Counts per 100 sweeps were 2500 in lower McElmo Canon and 5 in Mancos. None taken in Larimer or Weld Counties. (Exp. Sta. ). NEBRASKA - Population light in middle Platte Valley, Dawson County, ranging from 2 to 3 per 10 sweeps. Light in Richardson and Pawnee Counties, ranging from 1 to 15 per 25 sweeps. Many predators present in all fields;'lady beetles, big- eyed bugs, lacewings and Orius spp. (Andersen, Hill). MISSOURI - ' Counts generally low in southwest, averaging 1 to 7 per sweep. Consid- erable build-up indicated from southeast area. (Kyd, Thomas).
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