INFLUENCE OF .SHOHT DlJOrcHT IN SAME SKASON 



13 



Table I. — Temporary control of weevil by (lroH<jht in May and Jnnr, Virtoria, Trx., 



1906. 







Temperature. 





Precipitation. 





Month. 



Abso- 

 lute 

 ina.xi- 

 mum. 



Month- 

 ly moan 

 maxi- 

 mum. 



Month- 

 ly nu>an 

 "aver- 

 age. 



D«>par- 

 turo from 

 nonnal. 



Num- 

 bpr of 

 rainy 

 days. 



Total 

 rain- 

 fall. 



Depar- 

 ture from 

 normal. 



^\■<><•vil iiii.l crop coii.litioMs. 



liKXi. 



»F. 



"F. 



»F. 



op 





Inches. 



Inches. 





April.. 



87 



79 



70.3 



-2.4 



6 



2.88 



+0.22 



Cotton planted carl V ill montli. 

 iStanci uneven. 



















May... 



96 



HI) 



76.4 



-1.6 



2 



.63 



-3.29 



Cotton hcjxan scpiarinK alumt 

 May 20. Wcrvils cv.miiij? 

 frotn hibernation in larKi- 

 numbers. No l)looins. as all 

 squares are destroyed as 

 formed. 



Junt'... 



103 



94.3 



83.7 



+ 1.5 



2 



.68 



-3. 03 



Weevils still coming' from hi- 

 bernation. .No l)loonis un- 

 til very last of month. iMi.-^t 

 generation weevils nearly all 

 (lestroycd while immat'iin'. 

 Number of weevils in Held 

 greatly deereased bv June 

 30. Blooms and bolls then 



































forming abundantly. 



July... 



97 



91.2 



82. 9 



-1.3 



12 



4.93 



+ 1.73 



Weevils so checkr'd bv .lune 

 conditions that l)cfor(> they 

 could multiply again a good 

 crop was set and a yield of 

 about one-half bale- was 

 gathered in September and 

 October. 



It should be noted that in this field a considerable portion of the 

 ground was exposed to sunshine through the unevenness of the stand. 

 The rainfall during April was suflicient to give tlie plants a good 

 start, and a fair growth was made through the month of May. April 

 and ^lay w^ere somew^hat cooler than is usual for those months. The 

 wee\nls wdiich had passed through hibernation in the vicinity of the 

 field were so abundant early in the season that squares became 

 infested as rapidly as they were formed. Squares began to form 

 before May 1, but no blooms appeared, and conditions seemed to 

 point to the inevitable failure of the crop until after the extreme heat 

 and drought of June. During June the maximum temperature 

 recorded w^as below 90° upon only one day, when it was 88° F. On 

 three days the maximum temperature recorded was above 100° F. 

 The mean maximum temperature for the month, 94.3°, is therefore 

 exceptionally high. During the seventy-four days between April 

 20 and July 3 rains fell upon only four occasions and the total precipi- 

 tation was less than IJ inches. This extreme heat and drought 

 produced a very marked change in the weevil conditions found in 

 this field. ThrouHi tlie <T:ra(lual dvint^: off of hibernated achilt weevils 

 and the long-continued destruction of their progeny, tlie number of 

 weevils to be found in the field was very greatly reduced. Following 

 the heavy and well distributed rains occurring in July, the plants 

 c^uickly put out large numbers of s([uares, and before the weevils 



