749 



SPECIAL INSECTS OF REGIONAL SIGNIFICANCE 



BEET LEAFHOPPER ( Circulifer tenellus ) - CALIFORNIA - Heavy, up to 200 per sweep 

 in Kings Count}'. Heaviest since 1965. Fall treatment ended; total of 164,299 

 acres of rangeland treated. (Cal. Coop. Rpt . ) . 



CORN LEAF APHID (Rhopalosiphum maidis ) - OKLAHOMA - Moderate to heavy on Sudan 

 grass windbreak around wheatfield in Jackson County. Occasional aphid noted in 

 2 wheatfields in Payne County. First report in wheat. (Okla . Coop. Sur.). NEW 

 MEXICO - Ranged 25-75+ per square yard in barley near Roswell, Chaves County. 

 (Mathews) . 



GREENBUG ( Schizaphis graminum ) - WASHINGTON - Light on wheat in Franklin County 

 from Kahlotus to PascoT (Klos termeyer) . NEW MEXICO - Very light (0-1 per linear 

 foot) in barley in Chaves County. Up to 4 per linear foot of wheat near Clovis, 

 Curry County, and at Portales, Roosevelt County. Up to 3 per linear foot in 

 wheatfields near Clayton, Union County. (Mathews). TEXAS - Damaged some small 

 grains in Cottle and Motley Counties. Some controls applied. Light throughout 

 most of Panhandle on small grains. Scattered reports of damage in Wilbarger and 

 surrounding counties. Heavy in some Motley County fields. Some controls on wheat. 

 (Boring et al.). OKLAHOMA - Averages per linear foot of wheat by county: Payne 

 10, Jackson 0.1, Custer 8, Major up to 5. (Okla. Coop. Sur.). KANSAS - Ranged 

 1,000-1,200 per row foot of wheat in portion of Lincoln County. Caused 25 percent 

 stand loss in one field, about 1 percent winged form. Controls planned. Light in 

 other areas of county. (Bell) . NEBRASKA - Up to 500 per linear foot damaged wheat 

 in Hamilton County. Damage less in rank growth. (Cranf ill) . MISSISSIPPI - Light 

 on young wheat in Noxubee, Oktibbeha, Winston, Attala, and Monroe Counties. 

 (Robinson) . 



SPOTTED ALFALFA APHID ( Therioaphis maculata ) - OKLAHOMA - Averaged 40 per square 

 foot in fall-planted alfalfa field in Payne County. Light (20-30 per 10 sweeps) 

 in 2 established fields. (Okla. Coop. Sur.). ARIZONA - Controls applied to 200 

 acres of alfalfa in Yuma County early this reporting period. Counts of 500 per 

 100 sweeps of alfalfa noted at Yuma later in period. (Ariz. Coop. Sur.). 



CORN, SORGHUM, SUGARCANE 



SORGHUM WEBWORM (Celama sorghiella ) - MISSISSIPPI - Larvae 11 per head from 10- 

 head sample of sorghum in Noxubee County. Still heavy on sorghum week ending 

 November 5. (Robinson). 



EUROPEAN CORN BORER (Ostrinia nubilalis ) - SOUTH CAROLINA - Surveyed 171 corn- 

 fields in 32 counties; economic in 20 percent of these fields in 1971 and 1970. 

 (Durant) . 



SOUTHWESTERN CORN BORER (Diatraea grandiosella ) - TENNESSEE - New county 

 records: Wilson, Trousdale, Sumner, Macon, Smith, De Kalb, Ca.nnon, Warren, 

 Grundy, Marion, Van Buren, Coffee, and Franklin. Collected and determined by 

 Pless and Gordon this period. (Gordon). 



WESTERN CORN ROOTWORM (Diabrotica virgifera ) - ILLINOIS - Adults found in De Witt, 

 Macon, Menard, Christian, Morgan, Sangamon, and Shelby for new county records. 

 (111. Ins. Rpt.) . 



SORGHUM MIDGE (Contarinia sorghicola) - NORTH CAROLINA - Damaged 50+ percent of 

 sorghum in random checked fields in Stanley and Harnett Counties. Destroyed 50- 

 acre field in Stanley County. (Hunt). 



