Resource Guide for Organic Insect and Disease ... - Cornell University
Resource Guide for Organic Insect and Disease ... - Cornell University
Resource Guide for Organic Insect and Disease ... - Cornell University
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level of pest control is likely to be higher on completely sprayed fields in which a good program<br />
of cultural controls has been implemented.<br />
In Figures 1 <strong>and</strong> 2, “good control” means statistically significant disease reductions of 75% or<br />
more, compared to an untreated control. “Fair control” includes trials with significant reductions<br />
of 50-74%, <strong>and</strong> any non-significant reductions of over 50%. The “poor control” group includes<br />
any results with less than 50% reduction.<br />
In vegetable trials, levels of disease suppression all fell into the “poor” category (Fig. 1). In fruit,<br />
a few studies reported results in the “good” <strong>and</strong> “fair” categories in trials against blister spot,<br />
sooty blotch, fly-speck, <strong>and</strong> cedar apple rust in apple; brown rot in peach; <strong>and</strong> Anthracnose in<br />
strawberry (Fig. 2).<br />
Number of Trials <br />
10 <br />
9 <br />
8 <br />
7 <br />
6 <br />
5 <br />
4 <br />
3 <br />
2 <br />
1 <br />
0 <br />
Basil -‐ downy mildew <br />
Cabbage -‐ black rot <br />
Cabbage -‐ Alternaria leaf spot <br />
Celery -‐ Pythium root rot <br />
Cucumber -‐ Pythium root rot <br />
Hydrogen Peroxide Efficacy: Vegetable Crops <br />
Good Fair Poor <br />
Cucurbits -‐ downy mildew <br />
Cucurbits powdery mildew <br />
Watermelon-‐ Anthracnose <br />
LeHuce -‐ downy mildew <br />
Pepper -‐ Anthracnose <br />
Pepper-‐ bacterial leaf spot <br />
Potato -‐ late blight <br />
Snap bean -‐ Pythium coHony leak <br />
Crop -‐ Pest <br />
Snap bean -‐ gray mold <br />
Snap bean -‐ white mold <br />
Spinach -‐ Alternaria leaf spot <br />
Spinach -‐ white rust <br />
Sweet potato -‐ Rhizopus rot <br />
Tomato -‐ early blight <br />
Tomato -‐ Septoria leaf spot <br />
Figure 1. Efficacy of hydrogen peroxide products against diseases of vegetable crops.<br />
4 <br />
Hydrogen Peroxide Efficacy: Fruit Crops <br />
Good Fair Poor <br />
Number of Trials <br />
3 <br />
2 <br />
1 <br />
0 <br />
130 <strong>Organic</strong> <strong>Resource</strong> <strong>Guide</strong><br />
Crop -‐ Pest <br />
Figure 2. Efficacy of hydrogen peroxide products against diseases of fruit crops.
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