INJURIOUS TO CARROT AND RELATED CROPS 197 



appear on their food plants in the spring. In Ilhnois the eggs 

 are laid in May and Jnne. They are deposited singly on the 

 leaves. The egg is -J^ inch in length, elongate, shining, light 

 orange when first laid but deepening to bright red just before 

 hatching. The egg has been observed to hatch in sixteen 

 days. The older nymph is similar to the adult but has the 

 abdomen blood-red. The nymphs become mature in July and 

 the adults, after feeding for a few weeks, go into hibernation 

 rather early. The insect breeds abundantly on various weeds, 

 including beggar-ticks, tick-seed, red-root, ground-nut, great 

 lobelia and neckweed {Veronica peregrinaf). It has also been 

 found injurious to corn, wheat and grass and the bugs often 

 give an unpleasant flavor to raspberries and strawberries. 

 There is only one brood developed annually. 



The injury to celery has been caused almost entirely by the 

 adults. They congregate in clusters at the base of the petioles 

 on the highest stalks and suck out the sap, causing the leaves 

 to wilt and die. Later they attack the lower leaves at the 

 center of the plant. Celery so injured is stunted and the stalks 

 more or less deformed, and much of it is rendered unsuitable for 

 market. 



When infesting celery, the negro-bug can best be controlled 

 by spraying with "Black Leaf 40" tobacco extract, 1 pint in 

 100 gallons of water in which 5 to G pounds of soap have been 

 dissolved. Much may be accomplished in preventing attack 

 by keeping down all wild plants on which the insect may breed. 



Reference 

 Mich. Agr. Exp. Sta. Bull. 102, pp. 13-18. 1893. 



The Parsnip Webworm 



Depressaria heracliana LinnaBUS 

 In growing parsnip and celery seed, much trouble is often 

 experienced from the depredations of small greenish yellow 



