LEAFHOPPERS OF THE SUGAR BEET. 37 



while sonio hac' none at all. The average would not have been more 

 than one leal'hopper to 25 beets. They were most nnmerons on the 

 hig-her, drier fields, and on the earh^ beets. Two patches of very 

 late beets close to the first one visited had no leafhoppers at this time. 



Eight females from this field were dissected, and fully developed 

 eggs were found in each one, 1> in one, 7 in another, and from 2 to 4 

 in each one of the others. Only large eggs could be seen with the 

 lens used, and probably some of these were crushed while being re- 

 moved. The fact that all females had fulh' developed eggs and that 

 there w^ere more females than males indicated that these adults had 

 been out a long time and were not new ones of a brood that had just 

 flown in from surrounding wild land. 



On June 29 a few were found in the late beets, but no nymphs were 

 found anywhere. 



July 10 the adults were present in about the same numbers as be- 

 fore, the females still containing eggs, and a few \ery small nymphs 

 were found. 



Jul}' 23 the adults Avere slightly less numerous, and the nymphs 

 from small to one-third grown and quite abundant. A few of them 

 were nearh^ grown, but no fresh males could be found. ^More 

 nynii^hs were found on the earl}^ beets, more " curly leaf '" on the 

 late ones. 



August 3 the nj'^mphs were mostly about two-thirds grown, some 

 were small, and some full-grown. Large numbers of adults of the 

 new brood were out, about half of the leafhoppers being adult at this 

 time. 



August 14 the adults were abundant. The leafhoppers were nearly 

 all adults or large nymphs, but a few small nymphs were still to be 

 found. 



On August 20 the insects were mostly adult, males being still in 

 the majority, but there was still quite a number of full-grown 

 nymphs. Many females were dissected and a few found that had 

 from 4 to 7 large eggs, but the rest had no sign of any. These few 

 were probably the last remnant of the over-wintered brood of females. 



September 12 the adults were still connuon and more males than 

 females were taken by sweeping. Large nymphs were still present 

 in small innnbers. Ten females were dissected, but no eggs found, 

 and the abdomens were all small. Evidentlv there was to be no egg 

 laying for some time, probably not that season. 



Note. — The season opened unusually late at Lehi in 1000, and 

 these dates would be from one to two weeks late for an ordinary 

 season. 



03754— Bull. 6G, pt 4—09 2 



