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Pear IPM Delayed Dormant Materials

by Louis Nottingham and Betsy Beers, March 23, 2017

Delayed dormant materials are about to go out for pears this season. We have been receiving questions about which materials will have the best efficacy. Here are the results from two bioassays conducted this spring. The first trial (Fig. 1) was done using a new protocol directly spraying psylla using a Potter spray tower and should be interpreted with caution. The second experiment was done by dipping psylla in materials, instead of directly spraying (Fig. 2).  Please keep in mind that this efficacy could change quickly in the OPs that can gain resistance as they are used again more frequently.

pear ipm winterform psylla dd materials 1
Figure 1. Percent mortality of winterform psylla of nine delayed dormant products using a Potter spray tower method. Beers & Nottingham preliminary data, 2017.
pear ipm winterform psylla dd materials 2
Figure 2. Percent mortality of winterform psylla to 10 delayed dormant products using a slide dip method. Beers & Nottingham preliminary data, 2017.
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