DESTRUCTION OF COllON F(»li.MS. 



(>r) 



of sta<2:es tlio ])n)|)or(i«)ii shown hy 'I'ahic \I (.> Imvc rcacluMl tho 

 adult staj^c in Louisiana and 'l\v\as in \\H){\ (i. c. ahoiil 17 pci- cent ), 

 it would appear that this woik of concclion prcNcnlcd ihc (Mncru'cnci^ 

 of from o4,()()l) to 42, ")()() adnh wccsiU u|)on an area of s aci-cs. 

 When it is considcM-cd tinil in spi((> of (his lav^c dc^l iMict ion of weevils 

 the I'esnhinLi' increase in \ i(>l(l aNcM-a^cd hardl\ ."){) |)oun(ls of (•(•lltm 

 ])ei- aci{\ the lu^ader will he ahle (o I'eah/e nior(> cleaiU ihan he cmild 

 \\ithonl such a eoin|)arison (he (i-(Mnendons inipoiM anee of (he factors 

 of nat nrtd c;)n(rol w hich do, nndei- (v\ce|)(ionally faNoi'ahlc con(hi ions, 

 nud<.e it possihh^ \o j)r()duee a N'ery |)r()(ital)le cro|), hecanse of (heir 

 direct vWcci in reduein«z; the lumdxM- of W(M'vils wliich i-each nia(ui-i(\. 

 It will l)(* understood, also, that (he to(al inoi'tality resullinL:- from all 

 factors must IxM'onie very larii;e indcHnl in ordcM' (o rednce (he damauc 

 done hy the small percentage which do survive, so that the dexclop- 

 nient of the croj) may far outstrip the insect attack. 



COLLECTIONS OF FALLEN AND OF DHIKD HAN(JI\(; FORMS I\ 1 '.)()(). 



In Tables X\' and XA'l are ])resent(Ml some of (he r"(^snl(s from 

 the work of 19()(). In these tables, however, it is possible to include 

 a statement of the number of w^eevil stages found in each examimi- 

 tion. In the collection of this material there was no particular selec- 

 tion of s((uares or bolls, but all forms w^ere taken as they occurred.^ 

 Sj)ecial collections were made, how^ever, for hanging and for fallen 

 forms, so that the proportion of hanging and of fallen forms could 

 not be considered as an indication of the proportion wdiich actually 

 existed upon the area from which collections were nuide. This 

 explanation applies both to Table XV and to Table XVI. 



Table XV. — Proportion of f mil destroyed by insect injury or hy naliiral causes, 



Louisiana, 1906. 



Class of fruit •■xaininod, and 

 locality. 



Falk-n bolls: 

 Mansfield... 

 Mansfiold. . . 

 Mansfield... 



Many 



-Many 



Orangcvillc. 

 C)rangovillo. 



Date. 



Aug. 24 

 Aug. 24 

 Sept. 29 

 Aug. 23 

 Aug. 23 

 Aug. 23 

 Sept. 30 



Totals, fallen boll.* 



Total ex- 

 amined. 



P'aiien squares: { 



.lohnsoiis Bayou i.\ug.22-27 



Mansfield 



Mansfield... 

 .Mansfield. . . 



.Many 



Many 



Orarigeville. 

 Orangeville. 



Totals, fallen squares. 



Aug. 24 

 Aug. 24 

 Sept. 29 

 Aug. 23 

 Aug. 23 

 Aug. 23 

 Aug. 23 



450 

 400 

 372 

 5.5.5 

 5.34 

 145 

 150 



2, m\ 



300 

 400 

 525 

 37 j 

 875 I 

 ,133 I 

 400 ; 

 500 



Weevil stages not 

 found. 



Number 

 of forms. 



4.170 



.392 

 300 

 .332 

 402 

 .39() 

 109 



no 



Per cent 

 of total 

 exam- 

 ined. 



87.1 

 75.0 

 89.2 

 72.4 

 74.2 

 7.5.2 

 79.3 



Infested by weevil. 



Number. 



193 

 2(i8 

 20 

 .^3(i 

 407 

 142 

 332 



.It I J) 

 4,S.25 

 51.0 

 .54.1 

 .38. 4 

 35. 9 

 .35.5 

 66.4 



1,776 



42.0 



100 

 40 

 153 

 138 

 30 

 31 



Per cent 

 of total. 



207 

 2.57 

 17 

 539 

 726 

 258 

 168 



2,394 



12.9 

 25.0 



las 



27v0 

 25.8 

 24.8 

 20.7 



M.3 



71.0 

 51.75 

 49.0 

 45. 9 

 61. 6 

 64. 1 

 64.5 

 33.6 



57.4 



Total 

 weevil 

 stages 

 found. 



.58 

 106 



47 

 153 

 l{i8 



36 



31 



225 

 207 

 257 

 17 

 .539 

 728 

 259 

 176 



2,408 



11575— But. 74—07- 



