Alternatives for Powdery Mildew Control on Lilac

Article Figures & Data

Table 2.

Effectiveness ratings of biorational compounds against powdery mildew on lilac.

Treatment	Whole plant*	Individual leaf*
1991
Bayleton 2 week interval	1.0 c**	1.1 c
Bayleton 4 week interval	1.0 c	1.1 c
M-Pede 2 week interval	2.0 bc	2.1 abcd
M-Pede 4 week interval	1.1c	1.6 bcd
SunSpray oil 2 week interval	1.0 c	1.0 d
SunSpray oil 4 week interval	1.0 c	1.0 d
Cloud Cover 4 week interval	2.8 abc	2.9 abc
Water control 2 week interval	4.0 ab	3.6 a
Water control 4 week interval	4.1 a	3.5 ab

1992
Bayleton	1.0 b	1.0 b
SunSpray + sodium bicarbonate	1.2 b	1.0 b
Saf-T-Side	1.0 b	1.0 b
SunSpray oil	2.2 ab	2.6 ab
M-Pede	2.6 ab	2.5 ab
Sodium bicarbonate	3.7 a	3.8 a
Water control	4.0 a	4.1 a

↵* Disease ratings based on a 1 - 5 scale; 1=0 - 20%; 2 = 21 - 40%; 3 = 41 - 60%; 4 = 61 - 80%; 5 = 81 - 100% infection.
↵** Means within columns and years with at least one letter in common are not significantly different.