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SPECIAL INSECTS OF REGIONAL SIGNIFICANCE 



ARMYWORM ( Pseudaletia unipuncta ) - MICHIGAN - Small colony of foui'th instar 

 larvae feeding on quackgrass in cornfield in Oceana County. Some feeding on 

 lower corn leaves. Many larvae parasitized and no controls needed. (Stebbins, 

 Cress). NEBRASKA - Scattered heavy infestations in corn in Phelps, Gosper, and 

 Hall Counties. One 20-acre field in Philps County completely destroyed. 

 (Cooksley, Miller). OKLAHOMA - Larvae damaged corn in Cimarron County. Controls 

 planned. (Okla. Coop. Sur.). 



BEET LEAFHOPPER ( Circulifer tenellus ) - CALIFORNIA - Surveys of sugar beet and 

 beans from Patterson south to Gustine, Stanislaus County, showed curly top damage 

 ranging from 5 to a high of 30 percent. Susceptible crops in Woodland, Davis, and 

 Natomas areas of Sacramento Valley show very little damage. (Cal. Coop. Rpt.). 



CORN EARWORM ( Heliothis zea ) - DELAWARE - Moths averaged 2-3 per night per light 

 trap in Sussex County. (BiJrbutis, Lesiewicz) . MARYLAND - Moths averaged 17 per 

 night in blacklight trap at Hurlock, Dorchester County. Infestations increasing 

 on corn ears in all areas. (U. Md., Ent . Dept.). TENNESSEE - Larvae damaged 

 whorls of late corn and ears of corn in milk and dough stages. Damage light to 

 heavy depending on location. Controls difficult due to rain and muddy fields. 

 (Gordon) . FLORIDA - Adults numerous among flowers and foliage of soybeans in 

 fields west of Gainesville, Alachua County. (Whitcomb) . OKLAHOMA - Moderate on 

 sorghum in Kay and Kingfisher Counties and in peanuts in Atoka County. (Okla. 

 Coop. Sur.). NEW MEXICO - Larvae 0-2 per ear in corn checked in Chaves County. 

 (Mathews). ARIZONA - Larvae averaged 2 per ear of corn at Kirkland Junction, 

 Yavapai County. (Ariz. Coop. Sur.). 



CORN LEAF APHID ( Rhopalosiphum maidis) - MONTANA - Heavy on corn in Glendive area 

 of Dawson County; populations lighter in areas of Sidney, Richland County and 

 Miles City, Custer County. (Pratt). WYOMING - Heavy on irrigated corn near Lusk, 

 Niobrara County. (Parshall) . NEW MEXICO - Scattered light to heavy populations 

 on whorls of grain sorghum and corn in Chaves County-. (Mathews) . OKLAHOMA - 

 Moderate on younger sorghum in Kay, Garfield, and Blaine Counties. (Okla. Coop. 

 Sur.). WISCONSIN - Very numerous in most fields but decrease evident in southern 

 counties. Unspecified species of lady beetle larvae and adults continue numerous, 

 and lacewing adults and larvae increasing in cornfields with heavy aphid popula- 

 tions; syrphid fly larvae numerous in some fields. (Wis. Ins. Sur.). MARYLAND - 

 Population levels light on corn in Frederick and Montgomery Counties. (U. Md., 

 Ent. Dept.) . 



GREENBUG (Schizaphis graminum ) - WISCONSIN - Counts of 20 per 50 sweeps in late 

 sorghum in Rock CountyT (Wis. Ins. Sur.). KANSAS - Economic on sorghum in Thomas 

 County; averaged 2,500 per plant in one field. Undetermined parasitic wasp 

 activity heavy in some fields as far south as Stevens County and abundant through- 

 out northwest district. Parasitic wasps may give sufficient control of greenbug 

 on sorghum throughout western districts soon. Greenbug parasitism 80-100 percent 

 in some northwest district fields. (Bell). OKLAHOMA - Light to moderate in Texas 

 and Cimarron Counties; numbers continue to decline. Few fields sprayed. (Okla. 

 Coop. Sur.). TEXAS - Populations declining in many fields in High Plains. 

 Beneficial insects very active in untreated fields with high rate of parasitism. 

 Very light greenbug populations in Hockley, Cochran, Bailey, Parmer, Deaf Smith, 

 Randall, Swisher, Hale, and Lubbock Counties. Averaged 5-12 per plant in untreated 

 fields in these counties. Light, averaged less than 4 small colonies per leaf in 

 most fields in El Paso, Pecos, and Reeves Counties. Light, less than 50 aphids 

 per plant in Martin and Midland Counties. (Rummel et al.). NEW MEXICO - Scattered 

 light to moderate infestations on sorghum foliage in Roswell area, Chaves County 

 and Mesilla Valley, Dona Ana County. (Mathews, Clayshulte) . COLORADO - Light to 

 heavy in Baca and Kiowa Counties; controls applied. (Hogan) . 



HOKNWORMS (Manduca spp.) - DELAWARE - Adults averaged 5 per night in blacklight 

 trap at Bridgeville, Sussex County. Averaged 2 eggs per plant in pepper plots in 

 area. (Burbutis, Lesiewicz). TENNESSEE - M. sexta (tobacco hornworm) and M. 



