20 PROLIFERATION IN CONTROL OF BOLL WEEVIL. 
At the end of Table V are given totals and average percentages 
for squares and for bolls, but the differentiation of the results for fer- 
tilized and unfertilized plats is more clearly shown in Table VI, which 
is practically a summary of Table V. In each case the totals show 
the amount of data upon which the conclusions rest. 
Taste VI.—Summary of data appearing in Table V, showing effect of fertilization upon 
formation of proliferation, and the mortality of weevils in squares and bolls. 
— BH | (eb oa 
3 |28 | weevil | Weevil |, Fencent |Ga |e 
5 Ss Oy : nS oftotal |35 B 
sl Sep stages stages eas oo S 
oo |S alive. dead. BEES ES lates 
| as iS dead. pO = 
Part of 3 |S0 ; eee aS Oe = 
plant. Plat on which grown. Ze OG er |e a gs Ba fee | eel ae eles 
sO faad| = ra fal R= et ot t= inl les | Ba [oe ae 
noe tel sa Ream PRS freer fl eee Mere il EN IES |= 2 
S$ BoS| 52) 2s) 5S) Ss | aS | 2S [Sb ,| BF 
ao (Sahl ae |e las | ae lege alesse 
Spe ls 2° |38/8° | $8 | 8° |S |ba8) ¢ 
SOS = ie dct | Gee |e alee cen 
Pe ric alla eal ce Rec |= Ae | 
| | | | 
SMUAreseas 4) herhilize dees ss aees eee 1,604 50.5 544 466 182 | 5320508) alOl 2) 14s8 18.9 
ID aias ae Winker; tilize cl eee eee 11,571 | 49.5 | 508 | 494] 159] 35) 23.8] 6.6] 17.2] 16.2 
Bollisa=ea- ertilizedis 2 yace om as oer 2,694 | 66.2 | 302 22 65 25 ALTh 8853) |e OA ela 
Doe sees Uniertilizede ass sseeeeceee 2,734 | 69.5 | 286 38 52 De A fea Regs aH TS 
Totalsandaverises|- sss -eeee = 8,603 |@61.9 |1,640 1,010, 458 93 (421.4) G8 545) 20 Jas neaeee 
| 
a Weighted average. 
An examination of Table VI shows that proliferation follows weevil 
attack in approximately two-thirds of the cases in bolls and in 
approximately one-half of the cases in squares. As between squares 
on fertilized and unfertilized plats, there is found a difference of only 
1 per cent, which is in favor of the fertilized plats. In the figures 
for bolls there is shown a difference of 3.3 per cent in favor of the 
unfertilized plats. Even if both these differences were on the same 
side of the account, they are too small to justify the conclusion that 
fertilization with acid phosphate, as used in these experiments, 
appreciably affected the percentage of instances in which prolifera- 
tion followed weevil attack. 
From a comparison of the mortality percentages it appears that, 
although among the squares from fertilized plats there is a slichtly 
larger percentage of squares showing proliferation following weevil 
attack, there is, on the contrary, a smaller difference in the average 
mortality which may be attributed to the presence of proliferation 
than is found among the squares from unfertilized plats. With 
squares on the unfertilized plats having a slightly smaller percentage 
showing proliferation there is a somewhat higher average mortality 
apparently due to the presence of proliferation. In a similar compari- 
son with bolls, among those grown on fertilized ground showing pro- 
liferation in 66.2 per cent of the injured locks, there was an average 
increase of 9.4 in the percentage of mortality, while in bolls grown 
on unfertilized ground showing proliferation in 69.5 per cent of 
injured locks the average excess of mortality apparently due to 
proliferation is only 8.1 per cent. 
