26 PROLIFERATION IN CONTROL OF BOLL WEEVIL. 
Increased mortality in squares without proliferation accompanying increased severity in weevil 
attack. ' & 
Number Namib Number | Per cent ; 
Variety. of are ges of stages, of mor- a 
squares. | found. ad. tality. é 
Kom ge Ps Dal See soc Moe eae Sere ee ee Oe es Dee eee eee 1,000 380 6 1.6 
INSGIVEGs 542 2 = Sete Cet Sate aes Oe ee eee ee ee ee oe ee 1,000 620 17 Pt | 
MervibOry se. 5580 2S ASee eke e Soa seek eae ee ely eee ee ~ 1,000 760 37 4.9 
SUING: eke See eee en a ere ou ALE een Sade cuorC ooo be suoowes 1,000 810 91 12 
The comparison given above shows very clearly the great increase 
in mortality accompanying increased severity in the weevil attack. 
The data here given furnish a very interesting confirmation of the 
conclusions stated in Bulletin No. 51 of the Bureau of Entomology 
(p. 119). The statement most directly confirmed is here repeated. 
By this time the number of weevils has become so great that the supply of squares is 
insufficient to meet their need for both feeding and oviposition. Selection of squares so 
that these two portions of their attack may be kept separate can no longer be exercised. 
Female weevils are forced to deposit their eggs in squares which have either received other 
eggs or been largely fed upon, and a much larger proportion of squares at this time shows that 
feeding punctures are made in squares having eggs or larve. By these two factors the 
mortality among young larve especially is greatly increased. 
An examination of the figures given shows that in Territory cotton 
were found twice as many weevil stages as in King, and among these 
there were 6 times as many dead. In Shine cotton having more than 
twice as many weevil stages as the King, 15 times as many stages were 
dead. 
INCREASED MORTALITY IN SQUARES AND BOLLS DUE TO 
PROLIFERATION. 
Next in order will be a special study of the increased mortality in 
squares and bolls which may be attributed directly to the formation of 
proliferation. The figures for squares and bolls together include more | 
than 20,000 observations. In many cases the records are taken from 
data which have been used in preceding tables. 
