392 
JOURNAL OF ECONOMIC ENTOMOLOGY 
[Vol. 17 
eggs were laid over a period of from 1 to 4 days. Under field conditions 
the number of eggs per female would probably be greater. The majority 
of the eggs hatched in about three days. The average length of time from 
the egg to the adult stage was about 35 days. Table 1 shows the seasonal 
history of the insect. The writer began the study too late in the season 
to observe the early feeding on the wild plants and that part of the table 
is approximated. 
Table 1. Seasonal History of Jalysus spinosus Say at Mountain Grove, Mo., 
1923 
Life Cycle 
Apr. 
May 
June 
July 
Aug. 
Sept. 
Oct. 
Nov. 
Hibernating 
Adults. 
O 
o o o 
o o o 
o 
' 
First 
Generation.. . . 
Nymphs 
o o 
Adults 
o o o 
* * 
* * * 
Second 
Generation.. . . 
Nymphs 
* * * 
Adults 
* * * 
* * * * 
* * * 
Third 
Generation.. . . 
Nymphs 
* * 
Adults 
* * 
* * * 
* 
* 
Fourth 
(Partial).. . . 
Nymphs 
* * 
Adults 
* 
Table II gives the length of the various stages as observed during the 
past season. 
Table II. Length of Developmental Stages at Mountain Grove, Mo. 
Stage No. Days Average No. Days 
Egg.. 3-6 4.0 
1st Instar. 3-10 6.5 
2d “ . 3-11 5.0 
3d “ . 2-10 5.6 
4th “ . 4-8 ■ 6.0 
5th “ . 6-10 _7.2 
21-55 Averages 34.3 
Control Measures 
Thoro applications of nicotine sulfate and Bordeaux mixture are 
effective in killing the nymphs and protecting the foliage from subse¬ 
quent attack by adults. Two applications, the first as soon as migration 
to the tomato is noticed, and the second early in August when the major¬ 
ity of the first brood nymphs are present, should give effective control. 
