INSECTS INJURIOUS TO THE POTATO. 243 



name, trinotata. Eacli beetle punctures a small hole in 

 the base of a stem by means of its beak, hollows out a 

 small cavity, and there lays a single small, oval, whitish 

 Qgg. From these eggs some small, white grubs with 

 brown heads hatch in a few days and commence to bore 

 into the stalk. These grubs keep eating, either in the 

 main stalk or branches, from August 1st to September 1st, 

 when they have become full-grown. At this time the 

 grubs are about one-half an inch long, of a dirty white or 

 yellowish color, with a yellowish-brown, horny head, and 

 without legs. About the middle of August, as a general 

 rule, the grub constructs a small, oval cocoon of chips and 

 fibres in the stalk of the vine near the surface of the soil, 

 and there transforms to the pupa. During late August 

 and September the mature beetles shed the pupal skins, in 

 which they have remained dormant for the last few weeks, 

 but remain in the vines during the winter, and do iiot 

 come forth till the following spring. 



Remedies. — On account of its internal feeding habits no 

 poison can be successfully used against this 2:)est, and the 

 only remedy, but a good one, is to rake up the vines and 

 burn them as soon as the potatoes have been dug. As this 

 insect also feeds upon the Jamestown weed, horse-nettle, 

 and other weeds of the Mghtshade family, or Solonacece^ 

 they should be kept cut down very closely. When the 

 grubs are noticed in the plants, a good allowance of fer- 

 tilizer will do much to quicken growth and thus enable 

 them to mature a crop. 



INJURING THE LEAVES. 



Colorado Potato-beetle {Lejjtinotarsa 10-lineata Say.). 

 First and foremost among the enemies of the potato- 



