SUMMARY AND C'o.N ( LI SIONS. 75 



The proportion of clear to cloudy days and the rclati\-c rainfall 

 seem to inihicMicc in considerable d(\i:i-ee the ellcct ixcnc^s of lii^^di 

 tein])eratiires. 



Conij)arison of inoi-tality records in localities infested foi- not 

 more than two yc^ars with t hosi* in localities iidested foi- from thice 

 to ten years shows a. total mortality a\(M-a;j:inL: ahont 10 per cent 

 ji^reater in the section lon«i:er infested. This increase A\as dne |)iin(i- 

 pally to tlu» i^riMiter elVectiveness of heat and pai'asites. \\hile in the 

 rec(Mitly infested area ants were exce|)t ionally (>(l"ect i\'e. Tlu^ |)i-inci- 

 ])al reasons for tlies(» dilfei'ences were probably the more moist cli- 

 nnvte and the more alnuulant ant distribution in th(^ recently infested 

 area. 



Nearly 70 per cent of all mortahty fonnd from heat or (livin<r 

 ocH'Tirred (hirin^j: tlu^ larval staire. The I'atio of mortality jx'i'cent- 

 a<2:es in vavh weevil sta_ij:e from lu^at is: Adnit 1, ])'iij)a ;i, larva 9. 

 An early sheddinij: of inlested forms is vc^ry desiiable. 



Whatever spacini^: may have l)een foimd advisable \\hei-e ^\('e^•iIs 

 were not ])r(\s(Mit, these records ])r()ve the <i:eneral soimdness of the 

 recommendation for increasin<i: the s])ace allowed each ])lant where 

 the weevils are abmidant. Central Texas shows the hi<j:h average 

 mortality of 21.8 ])er cent by parasites in hano:in<j: scpiares, 8.4 per 

 cent in haniring bolls, and 5.7 ])er cent in fallen squares. Owino; 

 to the small niunber of observations made in southwest ei-n Texas, 

 western Louisiana should really be ranked first, with 89.4 in average 

 percentage of total mortality among hanging dried ])()lls, while cen- 

 tral Texas is second, with 28.8 per cent. Among hanging dried 

 squares central Texas stands first, with 65.4, and western Louisiana 

 second, with 61.3 per cent. Among fallen bolls eastern Texas ranks 

 first, with 50 per cent mortality, and western Louisiana second, 

 with 33.4 ])VY cent. In eastern Texas alon(> did the number of fallen 

 bolls examined exceed the number of fallen s(piares. Among fallen 

 squares southern Texas has a long lead in total mortality, with 70.7 

 per cent, as compared with central Texas, with 50 per cent. The 

 high percentage found in this class is based upon much {\w larg(\sl 

 series of examinations made for any class in any section, and the 

 figures are therefore exceptionally reliable and significant. 



In degree of benefit from natural control, the six groU])s of locali- 

 ties rank as follows in average percentage of total mortality 



Per con t. 



Southern Texas 02. (i 



Central Texas 45. 5 



Western Louisiana A'.\. 2 



Eastern Texas 41.4 



Northeastern Texas 31.9 



Southwestern Texas 2G. 



