How to Manage Pests

UC Pest Management Guidelines


Relative Impact of the Timing of Pesticide Applications on Natural Enemies

(Reviewed 6/06, updated 6/06, corrected 1/20)

In this Guideline:

Oil Oil + pyrethroid1 Oil + OP2 Oil +IGRs3 Oil + spinosad Bt4 IGRs3 Oil spinosad IGR5 OP2 pyrethroid1 spinosad carbamate6 Oil Neo-nicotinoid7
aphid parasites (Aphidius spp.) L L L L L L L L L M L-M8 L9 H H
caterpillar parasite (Copidosoma)10 L L L L L L L L M M H H M-H H H
(Macrocentrus) L L L L L L L L M M H H M-H H H
lacewings L L M L L L L L L M M L–M L-M H M
lady beetles (Chilocorus spp.) L L L L L L L L M L H H H H
minute pirate bugs L M M L L L L L L L H H M H
predatory mites (Galendromus sp., Typhlodromus sp.) L H L L L L L L L L M H L H L
scale parasites (Aphytis sp.) L H L L L–M L L L H M H H H H H
spiders L L M L L L L L L H L H

H = high     M = moderate     L = low     — = no information

1 pyrethroid (e.g. Asana, Warrior)
2 OP = organophosphate (e.g. Diazinon, Guthion, Imidan)
3 IGR = insect growth regulator (Dimilin, Intrepid, Esteem, Seize)
4 Bt = Bacillus thuringensis
5 Inseason use of some IGRs (e.g., methoxyfenozide-Intrepid) has a reproductive impact on parasites and lacewings
6 carbamate (e.g. Sevin).
7 neonicotinoids (Actara, Provado)
8 inseason use of OPs on aphid parasites: Diazinon = M, Imidan = L
9 inseason use of pyrethroids on aphid parasites: Asana = L, Warrior = —
10 [=Paralitomastix]



[UC Peer Reviewed]

UC IPM Pest Management Guidelines: Prune
UC ANR Publication 3464

General Information

C. Pickel, UC IPM Program, Sutter/Yuba counties
F. J. A. Niederholzer, UC Cooperative Extension, Sutter/Yuba counties
W. H. Olson, UC Cooperative Extension, Butte County
F. G. Zalom, Entomology, UC Davis
R. P. Buchner, UC Cooperative Extension, Tehama County
W. H. Krueger, UC Cooperative Extension, Glenn County
Acknowledgment for contributions to Insects and Mites:
W. O. Reil, UC Cooperative Extension Solano/Yolo counties

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