332 PESTS OF ORCHARD AND SMALL FRUITS 
will largely avert injury. The material should be applied thoroughly 
and with ample force. 
The Plum Curculio (Conotrachelus nenuphar Herbst.) 
The fruits of plum, apple, and cherry, and sometimes of peach, are 
subject to injury by this pest. Round or crescent-shaped punctures 
are made in the sides of the fruit by 
the adult beetles in feeding and egg 
laying. Within the fruit a grub or worm 
develops. 
The punctures made by the adult are 
of two sorts. In feeding, the beetle 
Fic. 515.— The Plum Curculio. Enlarged and 
natural size. Original. 
gnaws out a small, round hole. When 
egg laying, it makes a crescent-shaped 
Fic. 514.—Egg-laying pune- cut around the point at which it has in- 
Here ee Gee serted its egg in the fruit. These in- 
Juries are especially serious on young 
fruit, causing them to grow gnarly and misshapen. 
The beetle itself is quite small, three sixteenths of an inch in 
length, dark in color with lighter markings, and has four ridges or 
humps on its back. Its mouth parts are at the end of a snout. 
The larva or grub is whitish, one third of an inch long, and entirely 
without feet. 
The beetles spend the winter in rubbish or similar shelter in or near 
