46 SOME INSECTS INJURIOUS TO TRUCK CROPS. 
least, accounts for one beet being badly affected while the adjacent 
ones are unharmed, fin the case of Eutettix strobi and its allies, 
where most of the leaves of a small plant are affected by the dis- 
tortion, the plant usually shrivels up and dies, but where only one or 
two leaves on a large plant are distorted the plant does not appear 
to be affected at all, and in no case does the color appear in any of 
the new leaves. In several cases small beets have been seen in which 
every leaf has been deformed by the work of strobi, and they had 
apparently stopped growing. 
In the case of the " curly-leaf," however, the abnormal condition 
apparently spreads from leaf to leaf until finally the whole plant is 
affected, even though the leafhoppers may have disappeared before 
the process is complete. This was abundantly demonstrated by the 
mother beets set out in the spring of 1906. These beets were selected 
from the best-looking beets of 1905, and would naturally have been 
ones that showed little or no effect of the " curly-leaf " the season 
before. In every case observed the first leaves sent up by these beets 
were as curly as the average of the year before, and most of them 
formed stunted lettucelike heads, and later withered and died. Some, 
however, survived through the season, and a few sent up stunted blos- 
som stalks, but as a seed crop they were an entire failure. This curl- 
ing took place before any leafhoppers were found in the beets, and 
in rows adjoining young beets that were not at all affected and did 
not become affected during the season. This would indicate that the 
agency, whatever it may be, that causes " curly-leaf " remained in the 
beet itself over winter and was transmitted to the first leaves in the 
spring. 
In early September, 1907, the sugar-beet region around Spreckels, 
Cal., was visited by the writer and a number of cases of what was 
commonly called " blight " or " curly-leaf " were examined. These, 
however, proved to be quite different in character from the " curly- 
leaf " condition caused by Eutettix tenella. The leaves of the beet 
were found to be covered with pale spots, the edges were turned down 
instead of up, and the whole appearance was quite different. A care- 
ful search was made over many acres for specimens of tenella, but 
none was found; instead a species of Empoasca was always found 
associated with this appearance of the beets. The matter will be dis- 
cussed further in connection with that species (p. 51). 
OTHER RECORDS. 
Prof. E. G. Titus reports that on a trip through the sugar-beet 
regions of the West in September, 1904, he found Eutettix tenella 
at La Grande and Echo, Oreg. At La Grande little damage was done, 
while at Echo one field of 10 acres was so seriously injured by what 
