Wetness duration, temperature and cultivar affect floral infection by Botrytis cinerea in alfalfa

Figures & data

Fig. 1 Effect of temperature on infection of alfalfa florets by Botrytis cinerea in detached racemes under controlled conditions. Columns topped with the same letter do not differ based on Duncan’s Multiple Range Test at P < 0.05. The dotted line represents the best fit based on polynomial regression analysis

Fig. 2 Effect of surface wetness duration infection of alfalfa florets by Botrytis cinerea in detached racemes under controlled conditions. Columns topped with the same letter do not differ based on Duncan’s Multiple Range Test at P ≤ 0.05. The dotted line represents the best fit based on exponential regression analysis

Fig. 3 (Colour online) Interaction of temperature and wetness duration on infection of alfalfa florets by Botrytis cinerea in detached racemes over time under controlled conditions

Table 1. Comparison of the incidence of floral infection by Botrytis cinerea in selected alfalfa cultivars in controlled environment studies of detached racemes at 12 and 24 h after inoculation, greenhouse studies of attached racemes, and in a field trial at Saskatoon, Saskatchewan

Cultivar	Floral infection (%)
	Detached, 12 h	Detached, 24 h	Whole-plant	Field trial
DK 135	13 a	54 a	40 a	3 a
OAC Minto	12 a	72 bc	36 a	4.5 ab
Iroquois	17 ab	68 b	36 a	6 abc
Beaver	12 a	84 bcd	43 ab	10 abc
Saranac	22 abc	83 bcd	48 abc	10 abc
Oneida-VR	20 abc	73 bcd	59 abcd	12 abc
Vernal	19 abc	92 d	49 abc	14.5 abc
Apica	26 abc	82 bcd	68 bcd	17 abc
AC Nordica	28 bc	86 bcd	75 d	14 abc
Algonquin	23 abc	91 cd	70 cd	19.5 bc
Heinrichs	29 bc	87 cd	71 cd	21.5 c
Apollo II	33 c	89 cd	79 d	22 c

(a-d) Means in a column followed by the same letter do not differ based on Duncan’s multiple range test at P ≤ 0.05.

Fig. 4 Effect of flower colour on floret infection by Botrytis cinerea in three alfalfa cultivars. Columns topped with the same letter do not differ based on Duncan’s Multiple Range Test at P ≤ 0.05