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SPECIAL INSECTS OF REGIONAL SIGNIFICANCE 



CORN EARWORM ( Heliothis zea ) - MARYLAND - Moths averaged less than 3 per night on 

 Eastern Shore. Egg counts in corn less than 1 infested ear per 30 surveyed. 

 Heaviest first-instar infestation averaged 4 percent in 35 acres near Preston, 

 Caroline County. None found west of Chesapeake Bay. (U. Md . , Ent . Dept . ) . WEST 

 VIRGINIA - Damage light to field corn in Putnam, Mason, and Wood Counties. (W. Va . 

 Ins. Sur.). NORTH CAROLINA - Larvae in corn (majority of fields with ears) 

 declining in Columbus County area. Indicates pupation occurring and subsequent 

 generation should appear on soybeans and cotton in about 3 weeks. Larvae in 

 Clayton, Johnston County, area and at Lewiston, Bertie County, area continue to 

 increase; sixth instars observed at Clayton indicating pupation will begin week 

 of July 26. (Bradley, Hunt). GEORGIA - Light to heavy in south-central area 

 tobacco. (French, July 17). TEXAS - Reported heavy in whorls of some grain sorghum 

 in Collingsworth County. (Clymer et al.). OKLAHOMA - Averaged 3 per 100 heads 

 of sorghum in Harmon County and 2 per 100 heads in Tillman County. Moderate on 

 corn in Cleveland County. (Okla. Coop. Sur.). KANSAS - Averaged 0-2 second to 

 fourth instars per ear in 5 fields of late-silking field corn in Harvey County. 

 (Bell). UTAH - Caused moderate injury to sweet corn in Washington County (Huber) ; 

 very light in northern areas (Knowlton) . 



CORN LEAF APHID ( Rhopalosiphum maidis ) - NEW MEXICO - Generally light but per- 

 sistent in Luna and Dona Ana Counties, controls applied. (N.M. Coop. Rpt . ) . 

 OKLAHOMA - Averaged 575 per plant on sorghum in Hitchland area and 725 per plant 

 in Hooker area of Texas County. Light to moderate in Cimarron County. Ranged 100- 

 3,000 per plant in tassels of corn in Texas County. (Okla. Coop. Sur.). KANSAS - 

 Light to moderate in sorghum surveyed in southwest, west-central, north-central, 

 northeast, and east-central districts. (Bell). WISCONSIN - Heavy in some fields 

 in central and southwestern counties. Moderate on ears and in silks in Grant and 

 Iowa Counties. (Wis. Ins. Sur.). MARYLAND - Winged adults in most fields in 

 Howard, Baltimore, Carroll, and Harford Counties. First-instar nymphs infested 

 5-10 percent of corn in Howard, Baltimore, and Carroll Counties. Nymphs usually 

 found deep in whorl in late whorl-stage corn. (U. Md., Ent. Dept.). 



GREENBUG ( Schizaphis graminum) - COLORADO - Light on sorghum in Larimer County 

 and other northeastern areas. (Hantsbarger) . TEXAS - Increased, but still below 

 1970 level. Some spraying with good control obtained. Most greenbugs parasitized 

 by a small braconid in Deaf Smith County field. Light to moderate greenbug 

 infestations in Dallas, Hartley, Parmer, Deaf Smith, Moore, Oldham, Castro, and 

 Hansford Counties. (Clymer et al.). OKLAHOMA - Averaged 110 per plant on sorghum 

 in Hitchland area and 50 per plant in Hooker area of Texas County. Light to 

 moderate in Cimarron County. Ranged up to 50 per leaf on sorghum in Caddo County, 

 colonies light. (Okla. Coop. Sur.). ARKANSAS - First infestations of season 

 observed in sorghum breeding plots in northwest area. Infestations relatively 

 light but more general than in other areas of State. Occasional plants with up 

 to 5-6 colonies per plant. (Boyer) . MISSOURI - Infested all fields checked in 

 west-central and southwest areas. Small colonies ranged 1-3 per plant in southwest. 

 Colonies ranged 1-8 per plant in west-central area with severe discoloration on 

 bottom 4-5 leaves. (Peters). KANSAS - Economic in sorghum in Johnson, Miami, 

 Shawnee, and Washington Counties. In Shawnee and Washington Counties, severe 

 infestations only on seedling sorghum (2 to 5-inch tall plants). In Shawnee, 

 Douglas, Nemaha, Marshall, Washington, Republic, Jewell, Cloud, and Clay Counties 

 parasitic wasps major factor in greenbug control. In some fields lady beetles 

 also appeared to be of significant importance in control. (Bell). 



NEBRASKA - Greenbug spotted and heavy, up to 2,000 per lower leaf in grain 

 sorghum throughout southeast corner. Increasing rapidly July 12-16 in Nemaha, 

 Gage, and southern Lancaster Counties, up to 3 leaves killed. Parasitism 

 variable, with up to 30 percent of aphids parasitized in few fields and almost 

 no activity in others. Predators, particularly lady beetles, abundant and 

 continue to increase. Near Mead, Saunders County, lady beetles in some fields 

 holding greenbug to 10 or less per plant. (Staples et al.). Lady beetles unusually 

 abundant in grain sorghum in Richardson County. (Aitken) . Little greenbug 



