384 FRUIT INSECTS 



advisable to plant strawberries continuously on the same land ; 

 some other crop should intervene. As soon as beds are 

 abandoned, they should be plowed up and not left as centers 

 of infestation for surrounding fields. Burning over the field 

 in early spring before any of the eggs have hatched has been 

 recommended as a satisfactory means of control, and doubtless 

 would be one of value under some conditions. 



Whenever possible, plants for setting should be taken from 

 uninfested fields, but when that is not practicable, they should 

 be freed of the aphids before planting. Wait till all the eggs 

 have hatched in the spring, and then dip the plants, roots and 

 tops, in tobacco decoction, or nicotine extract, one part in 

 1000 parts of water, or they may be fumigated with hydro- 

 cyanic acid gas, using 1 ounce per 100 cubic feet of space for 10 



minutes. 



Reference 



Del. Agr. Exp. Sta. Bull. 49, pp. 3-13. 1900. 



The Strawberry Crown-moth 

 Sesia rutilans Henry Edwards 



On the Pacific slope the strawberry, blackberry and rasp- 

 berry are subject to injury from the attacks of a borer, the larva 

 of a clear-wing moth. The dirty white, brown-headed cater- 

 pillar, three fourths inch in length when full-grown, burrows in 

 the crown and causes the plant to wilt, dry up and die. 



In the southern part of their range the moths are on the wing 

 during May and June, being most abundant the last of May; 

 in Washington they are abroad in July. The female moth has 

 an expanse of nearly an inch ; the body is black, marked with 

 yellow lines and bands ; the fore wings are blackish-brown with 

 yellow rays along the veins. The hind wings are transparent 

 with a narrow border of brown-black. The male is smaller and 

 has the transparent areas of the wings larger. The moths are 



