Resource Guide for Organic Insect and Disease ... - Cornell University

the individual species in a group, as well as the life stage to which the pesticide is applied;
therefore, the efficacy data should be considered only as a general guide.
Against vegetable insect pests, plant and petroleum oil products have been only partially
effective, except for a good result in one trial against pest mites (Fig. 1). On fruit crops, oils have
5
Plant and Petroleum Oil Products Efficacy:
Powdery Mildew Diseases
Good Fair Poor
4
Number of Trials
3
2
1
0
Apple Blueberry Cherry Peach Grape Le8uce Cucurbits
Crop
Figure 3. Efficacy of plant and petroleum oil products against powdery mildew in
different crops.
2
Efficacy of Essen6al Oil Products: Arthropods
Number of Trials
1
Good Fair Poor
0
Beet armyworm
Citrus red mite
Onion thrips
Pacific spider mite
Silverleaf whitefly
Spider mite
Pest
148 Organic Resource Guide
Figure 4. Efficacy of essential oil products against arthropod (insects and mites) pests.