583 



CORN, SORGHUM, SUGARCANE 



EUROPEAN CORN BORER ( Ostrinia nubilalis ) - KANSAS - Blacklight trap catches 

 indicate heavy flight of first-generation moths in Republic County, still 

 increasing. In Brown County, flight appears to be decreasing. (Bell). NEBRASKA - 

 Sharp increases in moth flights at Plymouth light trap; 1,016 caught night of 

 August 2. Egg laying underway but no first instars to date. (Berogan) . Moth 

 emergence estimated at 30-50 percent in southeast and east districts. (Keith). 

 MINNESOTA - Second-generation moth emergence increased but no egg masses found. 

 Cool weather, especially cold nights, greatly reduced or stopped moth activity. 

 If weather remains cool, second generation may not be problem. Most larvae not 

 pupated; potential for heavy second-generation populations remains. (Minn. Pest 

 Rpt . ) . WISCONSIN - Moth catches in blacklight traps increased at many sites on 

 July 31 and August 1. Cool temperatures depressed larval and pupal development 

 and reduced moth activity at night; moths observed flying in cornfields at midday. 

 Very few egg masses found in corn. Larval development and degree of infestation 

 continue quite variable among different areas of State. (Wis. Ins. Sur.). IOWA - 

 Adult emergence 100 percent as of August 5. (Iowa Ins. Sur.). ILLINOIS - Very 

 little egg laying in south-central and western areas, although moth emergence 

 almost complete. Based on first-generation populations these areas potentially 

 most likely to have heavy second generation. Moth emergence in northern area 40 

 percent. Field observations indicate egg laying will be spread over period of 2- 

 3 weeks. (Sur. Bui.). MICHIGAN - Peak collection from Monroe County blacklight 

 station totaled 249 moths on July 30; 374 moths (143 females, 231 males) collected 

 nights of July 29-31. Montcalm County station trapped 134 moths week ending 

 August 1. Sporadic emergence expected throughout August. Activity indicates 

 increase over second-brood counts of previous seasons. Growers of susceptible 

 crops must be alert until end of this growing season. (Newman). 



OHIO - O. nubilalis infested 28 percent of Ashtabula County field corn; averaged 

 one larva per plant. Averaged 18 percent infestation in Trumbull County, with 1.5 

 larvae per plant. In Columbiana County, 20 percent of plants infested with 

 average of 1.8 larvae per plant. (Andress) . VIRGINIA - Generally less than 20 

 percent of stalks infested in New Kent, King and Queen, Middlesex, Essex, Hanover, 

 and King William Counties. Infestation ranged 25-50 percent in Richmond, Lancaster, 

 Northumberland, and Westmoreland Counties. Generally, infestations of less than 

 50 percent not economic. (Allen). MARYLAND - Moth flights averaged 21 per night 

 in Queen Annes County, 10 per night in Dorchester County, and less than 1 per 

 night in Worcester County. Infestations of 60-100 percent can be found in all 

 counties. Most fields remain light to moderate (10-50 percent). (U. Md., Ent . 

 Dept.). DELAWARE - Adults averaged 42 per night in blacklight trap at Bridgeville, 

 Sussex County. Larval infestation 15 percent on untreated pepper fruit. No fresh 

 egg masses noted on pepper plants as of August 5 at Bridgeville. (Lesiewicz) . New 

 JERSEY - Fresh egg masses observed on sweet corn August 2 in East Brunswick area, 

 Middlesex County. (Ins.-Dis. Newsltr.). 



FALL ARinfWORM (Spodoptera frugiperda ) - TEXAS - Continues troublesome on grain 

 sorghum in Jones, Baylor, Hardeman, and Haskell Counties in whorls. Feeding on 

 young grain sorghum in Gonzales and surrounding counties. In some fields 30-50 

 percent of foliage consumed. (Boring et al.). OKLAHOMA - Moderate to heavy on 

 sorghum in western half of State. (Okla. Coop. Sur.). KANSAS - Heavy in whorls of 

 40-inch late-lanted corn near Chapman, Dickinson County. (Bell). WISCONSIN - Early 

 instars evident on corn leaves in some Manitowoc County fields. Few adults 

 collected in blacklight trap at Seymour, Outagamie County. (Wis. Ins. Sur.). NEW 

 JERSEY - Moderate on sweet corn in East Brunswick area, Middlesex County. (Ins.- 

 Dis. Newsltr.). MARYLAND - Light and spotty on Eastern Shore corn. Heaviest 

 infestation near Chesterville, Kent County; 2 percent of 100-acre stand damaged. 

 (U. Md., Ent, Dept.). KENTUCKY - Larvae damaged corn in Hopkins, Henderson, and 

 Daviess Counties. Averaged one larva per stalk in one field. (Barnett) . 

 TENNESSEE - Observed on small corn in Franklin County; scattered within fields; 

 second instars feeding in whorls. (Mullett) . 



