TRUCK CROP INSECTS 
WM. MOORE. 
During the year 1914, work on several different projects was 
carried out by this section beside the general breeding work of 
the insectary. The factors influencing the successful fumigation of 
greenhouses with hydrocyanic acid gas as a means of controlling 
insect pests were studied, but as this work was rather technical in 
character and has neither been completed nor the practical appli- 
cations determined, it would be inadvisable to report on it at this 
time. 
White Grubs: During the spring, it was noticeable that large 
numbers of June bugs or May beetles were emerging. They were 
abundant about the lights and in many places, attracting con- 
siderable attention from various people. As the larva of the 
June beetle is the common white grub, which is so injurious to 
farm and truck crops, ornamental plants and in the lawn, an effort 
was made to determine which species would emerge this year and 
in what parts of the State. Four species were found to be particu- 
larly abundant: Lachnosterna fusca, Lachnosterna rugosa, Lachno- 
sterna dubia, and Lachnosterna grandis. 
The result of this work is shown in the accompanying map. 
Due to limited funds, it was impossible to travel extensively over 
the state, so that in collect- 
ing data wherever possible, 
it was requested that people 
send in a number of speci- 
mens. A few night trips 
were taken through the 
State but, unfortunately, no 
data was obtained from the 
lower tier of counties. Al- 
though it was known that in 
Jackson County the beetles 
were abundant, no_ speci- 
mens were obtained. Lach- 
osterna fusca and rugosa 
Fic. 8. Lachnosterna fusca, Froehl. 1 pupa. 2 larva, . ap 
3and4imago. Bu. Ent. U.S. Dep. Agriculture. seem to be generally distt ib- 
