316 JOURNAL OF ECONOMIC ENTOMOLOGY [Vol. 12 



On our next visit to Helm on July 16, A. coronata was dry and the 

 insects had disappeared from the plants. After the pasture vegetation 

 became dry, an occasional specimen was taken on green annual and 

 perennial plants growing among the dried Filaree on the plains and 

 foothills during the summer. 



The beet Icafhopper was bred in large numbers from Red Stem Fil- 

 aree growing under natural conditions near Coalinga. The plants were 

 collected on May 22, and the adults were reared on June 25, in the 

 hothouse. E. tenella was taken on 20 species of plants growing on the 

 plains and foothills, 5 of which belong to the Saltbush family. The 

 insects were found most abundant on Red Stem Filaree. 



Invasion of Beet Leaf hopper in Cultivated Area 



A brief account of the number of beet leafhoppers present in the 

 cultivated area of the San Joaquin Valley up to the time of the invasion 

 of the pest will be given. 



Throughout the winter, the leafhopper was taken in small numbers 

 by striking the foliage of blighted beets a few blows with the hand or 

 by shaking the leaves. During the first three months of the year, dark 

 colored specimens were captured on beets planted in December at 

 Manteca by Hartung. 



Professor Smith, Dr. E. Carsner and Thomas were unable to find a 

 single beet leafhopper in the beet fields at Connor, Corcoran, Goshen 

 Junction, Chowchilla and Manteca on April 7-11, but a small percent- 

 age of curly leaf was observed in the beet fields at Connor and Manteca. 

 No hoppers were collected on green vegetation in the cultivated terri- 

 tory. Hartung and the writer found that 4 per cent of the beets 

 planted in December were bhghted at Manteca on April 22. On this 

 same date no adults were caught but nymphs were found on diseased 

 beets. From the evidence at hand, apparently no adults of E. tenella 

 were present in the cultivated districts in the localities investigated 

 by the various scientists on April 7-22. 



On April 24-25, Hartung found large numbers of pale green or cream 

 colored hoppers in the beet fields at Le Grand, where a few weeks 

 previously no adults occurred. Pale green or cream colored specimens 

 were taken on plants of the Saltbush and related families at Coalinga 

 on May 9, but more abundantly on these plants in the cultivated 

 regions on May 16-21. 



After the invasion of the pest into the cultivated sections, the hop- 

 pers were far more abundant on different species of Atriplex than on 

 any other plants of the Saltbush family. The vast area of Atriplex 

 along railroad tracks, roadsides, fences, in grain, alfalfa and vacant 

 fields, alkali sinks, near hay and straw stacks far exceeds the beet 



