ORCHARD INSECTS OF THE PACIFIC NORTHWEST 



59 



Lesser Appleworm 



The lesser appleworm (Grapholitha prunivora (Walsh)) has recently 

 been discovered in eastern Oregon where it has been causing consider- 

 able injury to prunes. It has also occurred for some years in British 

 Columbia, and is known as a serious pest of apple in sections of the 

 eastern parts of the United States and Canada. The egg, larva, and 

 adult moth are somewhat similar in appearance to the corresponding- 

 stages of the codling moth, except that they are smaller, and the 

 habits of the insect are also similar. Control in the East has been 

 much the same, but it is not certain that it would be safe to use lead 



Figure 66. — A, 



Full-grown larva of eye-spotted budmoth; B, eye-spotted 

 budmoth. About X 2 l A. 



arsenate on prunes, and one or two thorough applications of nicotine 

 sulfate and summer oil emulsion, as used for aphids, and applied in 

 May or early in June, are suggested. 



Destructive Prune Worm 



The destructive prune worm (Mineola scitulella Hulst) has been 

 injurious only in southern Idaho, where it has become a rather 

 serious pest of prune trees. Its habits are somewhat like those of 

 the bud moth. The partly grown brown worms spend the winter in 

 small hibernacula woven of silk and placed in the smaller crotches or 

 hi crevices in the bark. These worms emerge in the spring before the 

 flower buds are open and bore into the buds, feeding entirely on the 

 inside and destroying many blossoms. They become full-grown in 2 

 to 4 weeks, when they drop to the ground and spin loose cocoons. 

 The moths emerge from these cocoons in June and lay eggs singly on 

 the lower surface of the prune leaves. The worms hatching from these 

 eggs burrow into the green prunes and cause considerable injury by 

 feeding on the fruit. This second brood of worms becomes full-grown 

 late in July or early in August and produces a second brood of moths. 



