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CORN, SORGHUM, SUGARCANE 



EUROPEAN CORN BORER (Ostrinia nubilalis ) - NEBRASKA - First to fourth instar 

 larvae averaged 11.1 per corn plant in 8 fields in Hamilton, Merrick, Nance, and 

 Howard Counties. Egg masses averaged less than 1 per 5 plants. (Berogan) . 

 WISCONSIN - Moth catches heavy until night of August 22, and cool weather reduced 

 activity. Egg counts below 10 per 100 plants in most sweet corn. Second-generation 

 larvae light in southwestern sweet corn. (Wis. Ins. Sur,). INDIANA - Counts of 

 first-generation larvae indicate infestations 1.5 times as great in 1971 as in 

 1970, statewide. (Huber) . MICHIGAN - Blacklight collections 100+ at Lenawee, 

 Monroe, Montcalm, and Ottawa County stations. Egg laying and larval activity 

 continues. Controls necessary on susceptible crops until frost. (Laughlin) . 

 OHIO - Second-generation larvae in bases of midribs of field corn in southern 

 areas. (Andress) . DELAWARE - Adults 128 per night in blacklight trap at Bridgeville, 

 Sussex County. Infestations in untreated sweet peppers averaged 22 percent with 5 

 fresh egg masses per 10 plants on August 26 at Bridgeville. (Burbutis, Lesiewicz) . 

 MARYLAND - Larval infestations ranged 20-84 percent in corn in late silk stage in 

 Queen Annes County. (U. Md . , Ent. Dept.). VIRGINIA - Numerous moths emerged in 

 Nansemond County area during past few weeks. Watch sorghum crop. (Roberts, 

 Allen). MISSISSIPPI - Third-generation egg laying underway in Marshall County. 

 Populations in corn moderate to heavy. (Davis). 



FALL ARMYWORM ( Spodoptera frugiperda ) - TEXAS - Moderate to heavy in Trans-Pecos 

 area; larvae 1-2 per sorghum plant whorl. This species and Heliothis zea (corn 

 earworm) still present in High Plains area. Most infestations ranged light to 

 medium. (Neeb, Clymer) . OKLAHOMA - Reported damaging sorghum heads in Jackson, 

 Kiowa, and Washita Counties. Moderate to heavy in late sorghum in Okmulgee County 

 and continues heavy in late corn in Tillman County. (Okla. Coop. Sur.). TENNESSEE - 

 Damaging late corn and milo in Coffee County. (Williams). MARYLAND - Increased. 

 Watch late-planted field corn statewide. (U. Md., Ent. Dept.). 



WESTERN BEAN CUTWORM (Loxagrotis albicosta ) - SOUTH DAKOTA - Larvae collected for 

 first time near Oral, Fall River County, August 12, 1971. Determined by G.P. 

 Sutter. Second and third instar larvae taken in association with corn cobs in 

 ditch-irrigated corn. In 200-acre field on August 18, 5-8 percent of plants 

 surveyed showed 1-3 second to fourth instar larvae. Previous to these collections 

 only moths recovered in State. (Jones). 



SORGHUM WEBWORM (Celama sorghiella ) - TENNESSEE - Counts of 4-5 per head in sorghum 

 in Tipton County. Sorghum in dough stage and some damage expected. (H.D. Gordon). 



WESTERN CORN ROOTWORM ( Diabrotica virgifera) - COLORADO - Adults light to moderate 

 in Montrose, Delta, Mesa, and Garfield Counties. Heavy in fields and some controls 

 applied. (Bulla). UTAH - Damage severe to 30 acres of corn in Box Elder County 

 (Knowlton, Lindsey) ; also damaged corn in portions of Cache County. (Knowlton, 

 Burningham) . 



NORTHERN CORN ROOTWORM ( Diabrotica longicornis ) - TENNESSEE - Abundant on corn 

 in Coffee County for a new county record. No damage reported. Continues to damage 

 corn in Morgan County. (Williams). 



SORGHUM MIDGE (Contarinia sorghicola ) - OKLAHOMA - Very heavy in late sorghum in 

 Wagoner County field. Destroyed 99 percent of grain in some heads. (Okla. Coop. 

 Sur.) . 



SPIDER MITES - UTAH - Unspecified species discoloring corn foliage in Weber County 

 (Boyer) ; treated 4,532 acres of corn in Utah County as of August 20 (Home); much 

 control applied in Sevier County. (Roberts). 



