RETENTION OK SIIKDDINC Ol' lM'i;Sii;i) |(ii;\l; 



:u 



increased the (lostnictioii of wccNil siaucs hv i hcsc rncini-s to alxuii (is 



pcM- ('(Mlt. 



DESIRABILITY OF RETENTION OR SHEDDING OF INFESTED FORMS. 



Still anotluM- anaiiucMiuMil of irciuMal rcsiills mav >(M-\<' to show a. 

 comparison IxMwchmi [\w foiii* dasscvs of foi'ins an<l Ix't ween liaiiuiiiLT 

 anil fallen fornis. This ai'i-aiii^einent is ^ivcii in TaMc 1\ . It may 

 serve to indicate for tlu^ entii'e infested area whatever Li,-eiieral adxaii- 

 tat''e (h(M-e nia\' he to th(^ [)hint in the sheihhnu' or in the iclention of 

 its inf(»st(Ml forms. 



T.MH.ii IV. — Summary of mortality results shown in Table III. ha nf/ing and fallen forms. 





Total 

 num- 

 l>er of 

 fornis 

 exam- 

 ined. 



Total 

 wee\Ml 

 stages 

 found. 



Weevil stages 

 dead. 



Cause of death. 



Pro- 

 por- 



ei.iss of fruit. 



Total 

 num- 

 ber. 



Per 



cent of 

 total 

 stages 

 found. 



Heat or 

 drying. 



Ants. 



Parasites. 



tion 



of 



forms 





Num- 

 ber of 

 stages 

 killed. 



Per 

 cent of 

 total 

 found. 



Num- 

 ])er of 

 stages 

 killed. 



Per 

 cent of 

 total 

 found. 



Num- 

 ber of 

 stages 

 killed. 



Per 



cent of 



total 



found. 



to 

 each 

 weevil 

 stage. 



Hanging forms: 

 Dried, hanging 



bolls 



Dried, hanging 

 squares 



17,359 

 7,004 



5,433 

 4,230 



1,650 

 2,227 



30.4. 

 52.6 



426 

 804 



7.8 

 19.0 



902 

 883 



16.6 

 20.9 



322 

 540 



6.0 

 12.8 



3.20 

 1.66 



lotals. hang- 

 ing forms ... 



24,363 



9,663 



3,877 



1,523 

 14,885 



40.2 



33.4 

 60.8 



1,230 



527 

 6,201 



12.9 



11.4 

 24.7 



1,785 



951 

 7,806 



18.7 



21.0 

 32.8 



862 



45 



778 



9.0 



1.0 

 3.3 



2.52 



Fallen forms: 



Fallen bolls... 

 Fallen squares 



22,085 

 39,908 



4,618 

 24,710 



4.91 

 1.62 



Totals, fall- 

 en forms . . 



62,593 



29,328 



16,408 



56.4 



6,728 



1,230 

 6,728 



23.0 



12.9 

 23.0 



8,757 



1,785 

 8,757 



30.0 



18.7 

 30.0 



823 



862 

 823 



2.8 



9.0 



2.8 



2.13 



Summary of all 

 forms:' 

 Hanging forms 

 Fallen forms. . 



24,. 363 

 62,593 



9,663 

 29,328 



3,877 

 16,408 



40.2 

 56.4 



2.62 

 2.J3 



Totals, all 

 forms 



SO, 9.56 



38,991 



20,285 



52.3 



7,958 



20.5 



10,542 



27.2 



1,685 



4.3 



2.23 



The possibilit}' of weevil damage having any relation to the reten- 

 tion of forms by the plant may be settled by a study of the proportion 

 of weevil stages to each class of forms. 



The last column of the table shows the average proportion of each 

 class of forms to one weevil stage found. It must be borne in mind 

 that many squares and bolls are destroyed l)y the feeding of the 

 weevils in which no eggs have been deposited. Undoubtedly in a 

 great many cases a young larva may have died when no trace of its 

 presence could be found at the time the examination was made. 

 This would especially apply to the hanging forms. From the pro- 

 portions given it appears that, among lianging forms, twice as many 

 bolls were examined for each weevil stage found as in the case of 

 stjuares, while among fallen forms the proportion is three to one. 

 Tiiis indicates that there is practically no difTerence in the proi)orti()n 



