ENGLISH: ILLINOIS TREES: THEIR INSECT ENEMIES 



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Control Measure 16 (end of circular) after all adults have 

 emerged from the soil. From southern to northern Illinois, this 

 period may vary from June 15 to July 15. The spray should be 

 applied to plants to the point of drenching them. 



Fletcher Scale, Lecanium fletcheri Ckll., fig. 50. — This is a 

 soft scale, usually occurring sparsely on yew but sometimes as 

 heavy infestations that cause serious damage. The overwinter- 



Fig. 50. — Fletcher scale: infestation on yew. The overwintering females 

 are pale yellow to brown in color and globular in shape. 



ing female, pale yellow to brown in color and globular in shape, 

 lays eggs in May. One scale shell may contain 800 or more eggs. 

 The flat, yellow crawlers that hatch from the eggs in June move 

 away from the mother shell to settle and feed on new growth. 

 This insect has only one generation a year. 



Control Measure 3 (end of circular) after all eggs have 

 hatched, about June 21 in central Illinois. 



Termites, Reticulitermes spp. — Termites may attack yew, 

 especially plants near an infested building. The white, antlike 

 insects build mud runways about the base of a plant or in the 

 crotches of the branches or along the larger branches. They eat 



