INJURIOUS INSECTS OF I9Q0Q AND IQIO. 
WORK OF 1909 WITH THE APPLE LEAF HOPPER. 
Empoasca malt. 
This practically marks the completion of work upon this insect, 
done under the provisions of the Adams’ Act, though some points of 
interest in its life-history yet remain, inviting further endeavor. 
The work of 1908 on this species was described in the Twelfth 
Report of the Minnesota State Entomologist. Summarizing that 
work we cite the following observations: 
us 
2. 
3. 
Fall-laid eggs were not found on any herbaceous plant. 
The insect winters only in the egg stage. 
Oviposition in summer was found to occur on the petiole of 
apple and clover, and probably occurs on other herbaceous 
plants. 
List of food-plants was given. 
Five nymphal stages were reported, covering a period of about 
twenty-two days. 
Adults may live fourteen days or over (1907 experiments indi- 
cate that they may live thirty days or more). 
The location and appearance of the winter egg-blister and the 
contained egg. 
Remedial measures. 
The work of 1909 practically corrobcrates that of 1908, and 
adds certain new facts. We add these conclusions and the chief 
items of work: 
9. 
10. 
ae 
12. 
13. 
This species deposits its winter eggs only on perennials, and 
of perennials, as far as can be determined, only on the apple. 
There are certainly three, and probably four broods in Minne- 
sota. 
Manner of emergence of nymphs from egg-blister. 
Further observations on life-history. 
Remedial measures. 
The work in 1909, as in 1908, was in charge of Dr. H. J. 
Franklin, and his report in detail is as follows: 
