580 



the light and try to make their escape, and are often exhausted and 

 perish before they become reconciled to their confinement. 







Dactylopius citri. 



a, an egg; b, larvae; c, first; d, second stage of male; e, 

 male ; f, dorsal view of female ; all greatly enlarged. 

 (After Berlese.) 



THRIPS. 



The members of this order have four wings; these are similar 

 in form, long, narrow, membranous, not folded, with but few or no 

 veins, and only rarely with cross veins ; they are fringed with long 

 hairs, and are laid horizontally along the back when at rest. The 

 metamorphosis is incomplete. The mouth parts are probably used 

 chiefly for sucking ; they are intermediate in form between those of 

 the sucking and those of the biting insects. 



There are various species in this State, and some are very 

 destructive to onion tops. Onions attacked by thrips will soon 

 have a whitish appearance, and the onions themselves will often 

 become stunted in growth. They also attack orange and lemon 

 trees, feeding on both the upper and lower surface of the leaves, 

 and giving to them a very whitish appearance. They are extremely 

 lively, leaping or taking flight with great agility. Some species 

 eat other insects, but the most live upon vegetation. 



Remedy. Clean cultivation. For onions spray with No. 15, and 

 destroy all tops as soon as crop is harvested. On fruit trees spray 

 with Nos. 10 or 14 (see pp. 490-492). In the case of onions there are 

 two obstacles to overcome ; the very young thrips work very largely 



