<aside> <img src="/icons/info-alternate_blue.svg" alt="/icons/info-alternate_blue.svg" width="40px" /> This database is based on the paper, “*Meta-analysis and review of pesticide non-target effects on phytoseiids, key biological control agents,”* written by Schmidt-Jeffris, et al. in 2021. $^1$ This paper looked at 154 published papers examining the impact of pesticides on lethal (adult and juvenile mortality) and sublethal (fecundity, egg hatch) effects on Phytoseiids in laboratory trials. Phytoseiids are the most common family of predatory mites that provide biological control of pest mites. $^2$ From this paper, we pulled the information on pesticides currently registered in California for use to control web-spinning spider mites in walnut orchard systems.

</aside>

• We assigned a rating for each active ingredient’s effects on predatory mite adults, juveniles, fecundity, and egg hatch.
• The active ingredients are grouped by the “summary rating,” which is the most harmful rating in any of the four life stages.
• If you click “Open” for any of the active ingredients, you can view the exact percent mortality/reduction for each life stage.

<aside> <img src="/icons/info-alternate_blue.svg" alt="/icons/info-alternate_blue.svg" width="40px" /> Key for column names

• AI: active chemical ingredient
• trade name: the registered product names for walnuts
• MOA: IRAC’s Mode of Action classification $^5$
• Summary rating: the maximum from all four life stages
• Adult rating: the classification based on the % mortality in adult phytoseiids
• Juvenile rating: the classification based on the % mortality in juvenile phytoseiids
• Fecundity rating: the classification based on the % reduction average eggs laid per female
• Egg hatch rating: the classification based on the % reduction in eggs hatched </aside>

<aside> <img src="/icons/forward_blue.svg" alt="/icons/forward_blue.svg" width="40px" /> You can search for specific miticide trade names by clicking the magnifying glass at the top right of the table.

</aside>

Untitled

Footnotes

1. Schmidt-Jeffris, R.A., Beers, E.H. and Sater, C. (2021), Meta-analysis and review of pesticide non-target effects on phytoseiids, key biological control agents. Pest Manag Sci, 77: 4848-4862. https://doi.org/10.1002/ps.6531
2. Appendix S1: the Phytoseiid non-target effects database
3. The harmful rating classification ranges are based on the International Organization for Biological Control (IOBC) database classifications.
4. The % mortality/reduction values in this database are corrected relative to the control using Abbott’s formula.
   1. Corrected percent mortality = 100*(percent alive in control - percent alive in treatment)/(percent alive in control)].
   2. Abbott, W. S. (1925), A Method of Computing the Effectiveness of an Insecticide. Journal of Economic Entomology, 18:265–267. https://doi.org/10.1093/jee/18.2.265a
5. The MOA classifications categorize active chemical ingredients by the biological process they target. Rotating between the different categories minimizes the chance for pests to develop resistance to a specific chemical group. The MOA classifications for miticides are:

moa_miteposter_v4.1_15Jan19.pdf

<aside> 📖

Source Database:

Miticide database

</aside>