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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Besides insects, other pests, including mites (Miller & Uetz.1998; Smitley & Davis 2000) <strong>and</strong><br />
snails (Mostafa & Abdel-Megeed 1996), have been reported to be susceptible to neem.<br />
A summary of field neem efficacy trials on vegetables <strong>and</strong> fruit commonly grown in the Northeast<br />
is compiled below. These university-based trials typically test products with untreated buffer<br />
rows <strong>and</strong> other conditions that may create unusually severe pest pressure. The level of pest<br />
control is likely to be higher when good programs of cultural controls <strong>and</strong> other sound pest<br />
management tactics have been implemented.<br />
In the figures below, “good control” means statistically significant reductions in either pest<br />
numbers or damage of 75% or more, compared to an untreated control. “Fair control” includes<br />
those with significant reductions of 50-74%, <strong>and</strong> any non-significant reductions of over 50%.<br />
The “poor control” group includes any results with less than 50% reduction.<br />
Vegetable arthropod pests (Fig. 1):<br />
Beetles (Coleoptera): Fair to good control has been obtained against Colorado potato beetle<br />
<strong>and</strong> Mexican bean beetle. The few published studies on flea beetles show poor to fair efficacy.<br />
Results have been mostly poor against pepper weevil.<br />
Caterpillars (Lepidoptera): Neem gives fair control of most caterpillars. Good results have<br />
been obtained against beet armyworm, cabbage looper, <strong>and</strong> diamondback moths.<br />
Thrips (Thysanoptera): Efficacy has mostly been poor, with one fair result, against onion<br />
thrips.<br />
Aphids (Homoptera): Generally good control has been observed, except <strong>for</strong> fair control<br />
against green peach aphid.<br />
True bugs (Hemiptera): Promising results against squash bug. Fair control of stink bugs was<br />
demonstrated in two trials.<br />
12 <br />
Azadirach6n-‐Based Products Efficacy: <br />
<strong>Insect</strong> Pests of Vegetables <br />
Good Fair Poor <br />
Number of Trials <br />
10 <br />
8 <br />
6 <br />
4 <br />
2 <br />
0 <br />
Beet armyworm <br />
Cabbage looper <br />
Diamondback moth <br />
Imported cabbageworms <br />
Colorado potato beetle <br />
Fall armyworm <br />
Flea beetle <br />
Green peach aphid <br />
Leafminers <br />
Lygus <strong>and</strong> sDnk bug <br />
Mexican bean beetle <br />
Other aphids <br />
Other lepidoptera <br />
Pepper maggot <br />
Pest <br />
Pepper weevil <br />
Pinworm <br />
Potato leaJopper <br />
Southern armyworm <br />
Squash bug <br />
Squash vine borer <br />
Thrips species <br />
Turnip aphid <br />
Whitefly species <br />
Figure 1. Efficacy of azadirachtin-based products against insect pests of vegetable crops.<br />
<strong>Organic</strong> <strong>Resource</strong> <strong>Guide</strong> 139
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