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SPECIAL INSECTS OF REGIONAL SIGNIFICANCE 



ARMYWORM (Pseudaletia unipuncta ) - CALIFORNIA - Heavy larval emergence from 

 lawns, grass and dichondra. Larvae covered lawns, driveways, walkways, and up onto 

 sides of buildings. What triggered this movement at this time not known. Suspect 

 weather change. Mass infestations noted at Sacramento, Sacramento County and at 

 Davis, Yolo County. (Cal . Coop. Rpt . ) . 



BEET LEAFHOPPER (Circulifer tenellus ) - UTAH - Counts of 3 per 25 sweeps of 

 Atriplex roseus in southern Curlew Valley, Box Elder County. (Knowlton) . 



CORN EARWORM (Heliothis zea) - MISSISSIPPI - Larvae averaged 5 per foot of row 

 in sorghum in Holmes, Webster, and Noxubee Counties. (Robinson). ALABAMA - Mixed 

 larval population of this species and Celama sorghiella (sorghiam webworm) 

 moderate in 200 acres of grain sorghum in Bullock County. (Kilgore) . SOUTH 

 CAROLINA - H. zea larval damage heavy to grain sorghum in Kershaw County. 

 (MontgomeryT . 



CORN LEAF APHID (Rhopalosiphum maidis ) - VIRGINIA - Had been widespread and heavy 

 on sorghum throughout eastern areas. (Allen). NEBRASKA - Small colonies still on 

 corn beneath leaf sheaths in Kearney and Harlan Counties. "(Keith) . 



SPOTTED ALFALFA APHID (Therioaphis maculata ) - NEW MEXICO - Light on alfalfa at 

 Belen, Valencia County. (Heninger) . UTAH - Light in San Juan County alfalfa. 

 (Jones) . 



CORN, SORGHUM, SUGARCANE 



EUROPEAN CORN BORER (Ostrinia nubilalis ) - NEBRASKA - Fall survey in southeast 

 district completed; 82.7 percent of plants examined infested and borers averaged 

 296.6 per 100 plants. These figures reflect slight decrease from fall of 1970 

 in this district. Preliminary results indicate major increase in borer populations 

 in south district. In Kearney County, plants averaged 96 percent infested with 

 638 borers per 100 stalks; in Harlan County 98.4 percent of plants infested with 

 borers averaged 823 per 100 stalks. Surveys to continue. (Keith, Berogan) . 

 IOWA - Percent infestation lower than 1970 in southern districts. State averages 

 for percent plants infested (81 versus 76) and borers per 100 plants (321 versus 

 241) increased. More borers fifth instar in 1971 than in 1970. (Iowa Ins. Sur.). 

 NORTH CAROLINA - Larval infestations in milo in Piedmont and Coastal Plains. 

 Limited survey showed 50 percent of plants in one field infested near Plymouth, 

 Washington County. (Hunt, Van Duyn) . 



FALL ARMYWORM (Spodoptera frugiperda) - KANSAS - Second to fourth instar larvae 

 1-5 on ears (soft to hard dough stage) of late corn in Riley County. (Bell). 

 OKLAHOMA - Still in whorls of late-planted sorghum in Kingfisher County. Light 

 in sorghum heads in Cotton County. Adults common in sorghum in Cotton County, in 

 cotton in Grady County, and at lights in Payne County. (Okla. Coop. Sur.). TEXAS - 

 Damage heavy in forage sorghum in Archer County. (Neeb et al.). 



SORGHUM WEBWORM (Celama sorghiella ) - MISSISSIPPI - Larvae 20 per head in 10-head 

 sample in Webster County sorghum field. (Robinson) . 



SORGIIUM MIDGE (Contarinia sorghicola ) - FLORIDA - Problem on late developing 

 sorghum at Quincy , Gadsden County. (Greene) . TEXAS - Increased in late-planted 

 grain sorghum in Fisher County past 14 days. (Boring, Spencer). MISSISSIPPI - 

 Adults 2 per foot of row in 2 sorghum fields in Holmes and Webster Counties. 

 Ranged 15-20 per head in late- blooming sorghum field in Noxubee County. (Robinson). 



BANKS GRASS MITE (Oligonychus pratensis ) - WYOMING - Many additional reports of 

 moderate to heavy damage to corn in Big Horn Basin area (Washakie, Big Horn, 

 Park, and Hot Springs Counties). (Burkhardt) . TEXAS - Decreased on grain sorghum 

 in Reeves and Pecos Counties. Moderate to heavy on grain sorghum in El Paso County. 

 Recent rainfall and cool temperatures aided in reducing activity in Trans-Pecos 

 area . (Neeb) . 



