-2- 



This insect feeds on small grains, preferring oats. Field detection surveys by 

 regulatory agencies are being initiated. New infestations will probably be found. 

 The cereal leaf beetle has been found in a total of 57 counties in Illinois since 

 1965. These counties are under a quarantine and comprise the current regulated 

 area. 



CORN INSECTS 



European corn borer pupation progressed rapidly this week, reaching 50 to 80 percent 

 in the southern section where some moths have emerged. In the central section, de- 

 velopment is just beginning. No pupation has occurred in the northern section. It 

 is too soon as yet to make predictions. 



Flea beetles are present in newly emerging corn, and some feeding is evident. Popu- 

 lations of this insect remain low. As yet, no serious damage has been observed. 

 There is still ample time for serious problems to develop. If fields of corn be- 

 come seriously affected, apply 3/4 of a pound of carbaryl (Sevin) or 1-1/2 pounds 

 of toxaphene per acre as a band spray over the row. Grassy areas bordering the 

 field should also be treated. Avoid using carbaryl near beehives and toxaphene 

 near fish-bearing waters. 



FORAGE INSECTS 



Alfalfa weevil populations continue to increase in the central and north-central 

 sections, and feeding is noticeable. However, alfalfa is rapidly approaching the 

 point of harvest in these areas. It is best to consider cutting the crop, removing 

 the hay, and spraying the new growth of the second crop if needed. Apply treatments 

 to the stubble if the new growth does not green-up in two or three days. 



In the south-central and southern sections , weevil populations are declining and it 

 would be best to cut the alfalfa rather than to use an insecticide. The new growth 

 of the second crop may require an insecticide treatment in some cases. See report 

 No. 5 for insecticide suggestions. 



LIVESTOCK INSECTS 



Horn flies are appearing in light numbers on pastured cattle. Populations will build 

 rapidly to economic levels (50 to 100 or more per animal) within the next few weeks. 

 Begin spray programs early, using sprays of crotoxyphos (Ciodrin) , dichlorvos (DDVP), 

 or pyrethrum for dairy cattle; toxaphene, for beef cattle. Toxaphene should not be 

 applied to beef cattle within 28 days of slaughter. 



Dust bags containing crotoxyphos or coumaphos (Co-Ral) can be used to control horn 

 flies on dairy cattle. Install them in the exit doors of milking parlors or barns. 



HOMEOWNER INSECT PROBLEMS 



The thirteen-year locust or periodical cicada , Brood XIX was very numerous in certain 

 areas of the state in 1959. They were especially numerous in western Illinois in 

 Pike, Calhoun, Jersey, Greene, and Scott counties; and were present in swarms in 

 most counties south of a line from Quincy to Springfield to Bloomington to Danville. 

 This brood is due to emerge again from the soil about May 25 in southern Illinois 

 and June 1 in the central part of the state. A few were observed on May 17 in ex- 

 treme southern Illinois. 



