100 INSECTS OF ECONOMIC IMPORTANCE 



The moths appear in July and deposit their eggs 

 on all parts of the plant, but chiefly along the stems; 

 these hatch and the larva bores into the stem and 

 then burrows along in the center of the stem caus- 

 ing it to rot and become severed from the vine; an 

 affected stem wilts and dies; the larva attains a 

 length of an inch and becomes full-grown in about 

 four weeks; it leaves the stem and goes into the 

 soil to pupate, the pupae remaining over until the 

 following spring; one brood here. 



Control — Insecticides or repellants of little or 

 no avail ; cut out the borers ; plant the early varieties 

 as a trap crop, or plant late varieties as late as 

 possible ; fertilize the soil well, and cover the plants 

 at several joints where new roots can be formed; 

 remove and burn vines as soon as crop has been 

 secured to destroy eggs and larvse; harrow soil in 

 fall and plow deep in early spring to kill pupae. 



The MELON PLANT-LOUSE ^^ (ApJiis gossypH) 



Passes winter in egg stage; breeds throughout 

 summer like other aphids; is more injurious farther 

 South. 



Control — Spray thoroughly with nicotine sul- 

 phate being sure to hit the undersides of the leaves. 



OTHER INSECTS INJURIOUS TO CUCUMBERS 

 AND MELONS 



Twelve-Spotted cucumber beetle (Diabrofica 12- 

 punctata). 



Squash ladybird (Epilachna borcalis). 

 Pickle worm (Diaphania nit id alls) . 

 Melon caterpillar {Diaphania hyalinata). 



18 Chittenden— U. S. Dept. Agr., Ear's' Bull. 914. 



