WHITE GRUBS IN LAWN 257 



deposit their eggs at that time on the stalks of weeds, such as giant 

 bur elder (evidently the preferred food plant), ragweed, burdock, 

 thistle, and others, close to the ground. The winter is passed in 

 this condition, the eggs hatch in the spring and the larvae then leave 

 their first food plant for garden plants in the vicinity. If a neglected 

 lot or weedy field is close to a flower garden, the latter is quite 

 sure to be affected, even if the garden itself is free from such weeds. 

 Control. Choice beds of lilies or other plants (or, if practi- 

 cable, an entire flower garden) may be protected from attack by a 

 six- or eight-inch board placed around the outside, the lower edge 

 an inch or more below the surface of the ground ; this board to have 

 on the outside a band of some sticky material like tree tanglefoot, 

 which will remain sticky or can be kept so by repeated applications 



FIG. 259. Tip of golden glow plant, wilting as result of attack of a stalk borer. 



during late spring and summer. This tanglefoot should be applied 

 far enough above the ground to prevent its being spattered with 

 earth during a rain. (See page 248 for other remedies.) 



Green Cabbage Worms. These cabbage pests are sometimes 

 found in destructive numbers on nasturtiums. If the white butter- 

 flies which produce them are seen in flower gardens, one may expect 

 nasturtium leaves to be eaten later. Hand-picking of the worms, 

 which are found on the under side of the leaves, is perhaps the 

 only practical remedy. White hellebore dusted generously over 

 the affected leaves will lessen their numbers. 



White Grubs in Lawn. Dead patches may appear in lawns 

 17 



