394 Bureau of Farmers' Institutes. 



work from the under side of the leaf, where they suck the juices 

 from between its walls. 



What are ilie c'j^j;s ou these maple twigs? Please uotice them. Some 

 twigs are covered with these eggs. What will kill them? 



Mr. Van Alstyne. — Those are the eggs of the forest-tree cater- 

 pillar that works on the maples. The only way is to destroy the 

 eggs. If they are allowed to hatch, very many will escape. 

 Where they are on the ends of the twigs they may be clipped off. 

 They are easily distinguished from the tent worm of the apple 

 tree, and one ought to examine the trees and destroy the eggs. 

 Green arsenite and arsenite of lead are also used in the spring 

 and summer, the latter being much cheaper than the paris green; 

 but it must be cut with potash, and. unless care is taken, the 

 foliage will be burned. If the difference in price, as between the 

 paris green and green arsenite was not much, I should use the 

 former. If the difference was more than three cents I should use 

 the green arsenite. It is more soluble and remains in suspension 

 longer than does the green, and, therefore, does not need so much 

 agitating while being sprayed on the trees. 



What is the cause of bugs in beans and peas, and what is the best way 

 to dispose of them? 



Mr. Converse. — The worm is caused by a fly which punctures 



the pod and lays an egg, which produces a worm. The worm 



turns into the bug which we see. Bisulphide of carbon is the 



remedy. Saturate a sponge with it and place in the bin or barrel 



holding the beans or peas, then cover it tightly with a blanket. 



The gas is heavier than the atmosphere; therefore settles. It 



is not only deadly, but highly explosive; therefore, do not go near 



it with any fire, and be careful not to inhale it. 



Does the planting of potatoes deeply, then hilling them up, prevent rot? 



Prof. Stewart. — It might in some cases. The sporee in the 

 blight fall on the ground and are washed into the soil by the 

 rains, where they fall on to the tubers and cause rot. So that, 

 under certain conditions, if the potatoes are planted deeply the 



