INSECTS AND INSECTICIDES. 
3 
The moths of the garden web worm appeared early 
in April and the false chinch bug and squash bug the 
first week in June. 
The parsnip butterfly was a common species in the 
plains region throughout the State, and to some extent 
in the mountains late in May. The tomato worm ap¬ 
peared June 1st, feeding on the tomato and tobacco, in 
particular. 
I am indebted to Prof. Howard, of the Department of 
Agriculture, and Prof. Cook, of the Michigan Agricul¬ 
tural College, for the identification of the garden web 
worm, and to a number of friends for specimens and facts 
in regard to some of the species mentioned. 
The people of our State may aid much in reaching a 
better knowledge in regard to the injurious insects of this 
region by furnishing specimens and information from 
their several localities. The State is so large and offers 
such a diversity of climate and agricultural productions, 
that associated effort of this nature is more imperatively 
necessary here than elsewhere. 
To further this end and to make this section of the 
Experiment Station as useful as possible to those in¬ 
terested, correspondence and specimens are solicited. 
INSECTICIDES. 
♦ 
Remedies used for the destruction of insect life are 
designed to be effective in either of two ways, according 
to their structure and mode of life. These may be ar¬ 
ranged into two classes: First, arsenical poisons, or 
such as kill through the stomach ; the second represented 
by alkalies, acids and oil mixtures, which are effective 
only as they come in direct contact with the insect to be 
destroyed. 
All insects which eat the structure of plants may be 
readily destroyed by the first mentioned; those which 
suck the juices only, can be destroyed by the second. 
