Minnesota STATE HorTiIcutTurRaL SOcIETvY. 25 
Whitewash for Mice. 
Mr. Latham. I have succeeded ‘in destroying plant lice with to- 
bacco solution. Have used a mixture of whitewash, cow manure 
and sulphur for mice and rabbits, painting it on with a brush. 
This is also a good disinfectant. It also protects the trunks against 
the sun, being a good reflector and reflecting the heat instead of 
absorbing it. 
Kerosene, Ashes and Tobacco for Lice—Pinching. 
_ Mr. Gould. It is hard to destroy leaf lice when they get well 
started. The wasp known as yellow-jacket will, however, if plenty 
enough, keep them in check. [I find it a nice point to make solu- 
tions of tobacco, carbolic acid, &€., strong enough to kill insects 
and not to hurt the tree. At evening when the lice are gathered 
together they can be destroyed by pinching. The ants seen there 
do not disturb the lice. But when all the green lice are killed the 
old ones of a darker color continue producing. 
Mr. Jordon. Mr. Sias has been successful with kerosene oil. It 
does not hurt the tree, and putting on a few branches clears the 
whole tree of lice. For the trunks of trees I have used a wash o¢ 
lime, cow manure and soft soap, putting it on in May, and have 
found it of great value in keeping the trees clean and healthy. 
Instead of soft soap, have sometimes used refuse from lye. 
Mr, Gideon, Used kerosene last year and it made no impression 
on lice. Used paris green and flour so abundantly that the leaves 
were burned, and the lice survived. 
Mr. Fuller. Thave taken an ash pail and thrown ashes up among 
leaves on aplum tree while the lice were young, and thereby cleaned 
them out. 
Mr. Tyler. Have used very strong tobacco solution, on peach 
trees, washing it off with clean water the next morning. Tobacco 
sickens the lice and they come off easy with clean water. 
Mr. Spaulding. Have found two varieties of aphis on plum 
trees. Have been most successful in pinching them. 
Natural. History of Aphis. 
Dr. Twitchell. I believe paris green would have been effective 
if thoroughly applied. The natural history of this insect is inter- 
