New York AaricutruraL ExprertmMent STation. 559 
VINEYARD 11. 


1897. 1898. 
PiecwmnPlewi... ae. ea saunerco to July 8. June 15‘to June2l 
AMIR he say os wie ce ces ne June 26 to July 1 June 15 to June 21 
PN eRTL ES oo et sg SOP eal oats ke June 24 to July 3. June 15 to June 20 
I eG aig ona. a in iis a oot as June 20 to July 1 June 11 to June 16 
EE a es se kw et 2 June 14 to June21 June 7 to June ? 
Meth he adn be oh as ee June 24 to July 1 June 13 to June 18 
1 Tn eg Sah Sieg ga na i es June 19 to June 2 June 10 to June 15 
CLUS 6 ps hg a June 20 to July 1 June 12 to June 17 
OE i Se uns a ea June 24 to July 1 June 138 to June 18 
SS Git bee Sls Pc iy June 24 to July 3 #£=June 16 to June 25 
Isabella Seedling .......... June 24 to July 1 June 12 to June 18 
PAMCTEOIE Petts eek dirs 6 0 bees June 14 to June20 June 7 to June ? 
EO on 9 eee es ara Ae a ae June 24 to July 3 June 16 to June 25 
RR CERMEN EME reas ces etek at ote: June 28 to July 3 June 15 to June 21 
USES, Es SER ea ee ——————-_ June 12 to June 17 
JOUSGl ot 6 Seater an ran June 24 to July 1 June 15 to June 23 
EE tial oie ok od iste a3 0's June 24 to July 1 June 13 to June 19 


HOW MAY SELF-STERILITY IN THE GRAPE BE 
ACCOUNTED FOR? 
With nearly all of the varieties under experiment the discharge 
of pollen from the anthers has been observed. In these cases it 
cannot be held that self-sterility is due to an insufficient supply of 
pollen. 
Some of the self-sterile varieties have long stamens. That long- 
stamened varieties become self-pollinated has already been shown. 
The short-stamened varieties are self-sterile or nearly so. Does self- 
pollination oceur with them? It certainly does in some instances; 
for covered clusters of certain short-stamened grapes have occasion- 
ally produced a little fruit. If self-pollination occurs with some 
short-stamened varieties it is reasonable to assume that it occurs . 
with all such varieties. It seems impossible that all the pollen of 
a covered cluster could be discharged and none of the pistils be- 
come pollinated even if the stamens are short." 
1 Green found that covered clusters of Lindley and Brighton set no fruit, 
but they set fruit perfectly when clusters of Delaware blossoms were inserted 
in the bags with them at the blooming period. Both Lindley and Brighton 
have short stamens. Cross Fertilization of Grapes. Minn, Exp. Sta, Bul. 
32:229, 1893, 
