CONTROL OF MORMON CRICKET WITH POISONED BAIT 



11 



feeding was recorded between 68° and 95°. Soil temperatures in 

 relation to the number of crickets feeding are shown in figure 3, B. 

 The range of temperatures in which numbers of crickets were observed 

 feeding falls between 75° and 130°, with the peak at about 108°. 



The time of day as affecting feeding is shown in figure 3, C. The 

 peak in the number feeding was observed between the hours of 8 and 

 10 a. m., with numbers ascending toward a peak after 4 p. m. Baiting 

 on a large scale, however, has shown that late afternoon baiting of 

 adult crickets is not so effective as that done during the morning. 



toUU 



1 



1 1 1 1 1 1 1 1 1 I 1 



i 1 i 1 i 1 ' l_ 



500 







— 



4-00 



- 





- 



300 



- 





A ~ 



200 



— 





A 



100 



— / 



A V 



/ V : 







~^ \ 



1 i ! i 1 V+ 1 i-* 



f \ I i i iS- 1 i 



60 70 80 90 100 110 100 90 80 70 



MORNING- AFTERNOON 



TEM PERATURE (°F. 



60 



60 70 80 90 100 110 120 130 14-0 130 120 110 100 90 80 

 MORNING- AFTERNOON 



TEMPERATURE (°F.) 



& 9 10 II NOON I 2 3 



A.M. P.M. 



TIME OF DAY 



Figure 3. — The numbers of crickets feeding on pan baits during 28 days, correlated 

 with air temperatures (A), soil temperatures (B), and time of day (C). 



Migration and Baiting 



The temperatures and time of day governing the feeding period 

 also govern migrations. In other words, feeding and migrating occur 

 under the same general conditions. This was brought out in the 

 pan-baiting experiments of 1938 with adults and also just as definitely 



