- 619 - 



plots and 90 in untreated plots in Spalding County. (Tippens) . SOUTH CAROLINA - 

 Percent damaged squares ranged 0-90 (averaged 5-8) statewide in well protected 

 fields, and 50-60 in fields where rain continues to interfere with control. 

 Migration stabilized at lower levels than 1970. (Sparks). SOUTH CAROLINA - In 

 Florence County, populations large enough to destroy all squares in unprotected 

 fields. Migration increasing rapidly. Top crop threatened if controls fail. 

 (Taft et al.). 



COTTON LEAF PERFORATOR (Bucculatrix thurberiella ) - CALIFORNIA - Sharp increase 

 in Imperial Valley desert cottono Previously infestations spotty. Repeat 

 applications of pesticides will be necessary. (Cal . Coop. Rpt.). ARIZONA - Still 

 factor in cotton and treatments applied at Yuma. Building up, but due to switch 

 of material now under control in Parker Valley, Yuma County. (Ariz. Coop. Sur.). 



TOBACCO 



TOBACCO FLEA BEETLE (Epitrix hirtipennis ) - MARYLAND - Heavy, over 50 per plant, 

 on tobacco in southern Prince Georges County. (U. Md., Ent , Dept.). 



DIFFERNTIAL GRASSHOPPER (Melanoplus dif f erentialis ) - KENTUCKY - Counts of 3-4 

 per plant in Madison County. One field showed liO-30 percent of foliar area 

 destroyed. (Barnett) . 



SUGAR BEETS 



TWOSPOTTED SPIDER MITE (Tetranychus urticae) - WASHINGTON - All stages increasing 

 on sugar beets at Toppenish, Yakima County. Damaged carrots grown for seed 

 throughout Grant County; in most fields 50 percent or more seed heads webbed. 

 (Landis, Hunter). 



MISCELLANEOUS FIELD CROPS 



BANDED SUNFLOWER MOTH ( Phalonia hospes ) - NORTH DAKOTA - In Cass County field, 

 larvae 1-20 per head on 40 percent of sunflower heads. Damage evident on heavier 

 infested heads. (Brandvik) . 



SUNFLOWER MAGGOT (Strauzia longipennis ) - NORTH DAKOTA - Infestations in all 

 fields sampled in Ransom, Steele, Walsh, Pembina, and Grand Forks Counties. In 

 Barnes County, 50 percent of sunflower fields infested. Infested stems in fields 

 ranged up to 100 percent in Pembina and Grand Forks Counties. (Brandvik, Kaatz) . 



A TEPHRITID (Gymnocarena diffusa ) - NORTH DAKOTA - Heaviest infestations in Grand 

 Forks County, 14 percent of fields infested. Up to 60 percent of sunflower heads 

 infested. Larvae in receptacle of heads. (Kaatz). 



A GALL MIDGE (Contarinia sp.) - NORTH DAKOTA - Surveys indicate no infestations 

 in Ransom and Barnes Counties. Steele, Walsh, Pembina and Grand Forks Counties 

 show less than 1 percent of sunflower heads damaged. Larvae no longer present 

 in previously infested heads. (Brandvik, Kaatz). 



POTATOES, TOMATOES, PEPPERS 



GREEN PEACH APHID (Myzus persicae ) - OREGON - Infested leaves ranged 35-100 per 

 100 leaf sample. Populations building up since early July and controls ineffec- 

 tive. Leaf roll symptoms heaviest in years and some growers may not harvest. 

 Growers with potatoes for seed most seriously affected. About 2,500 acres 

 affected in Klamath Falls area of Klamath County. (Schuh) , INDIANA - Economic 

 numbers observed in 2 of 5 pepper fields in northwest district. (Matthew). IDAHO - 

 Populations in potato seed-producing areas mostly in field margins on weed host 

 plants. Populations near normal in eastern area. (Spencer et al.). 



