November/December 2022 - 15

DR. BUGS
Spider mite activity on plants can be increased after exposure to the residues of certain pesticides.
or those containing the lowest concentration
of pesticide residues. In addition, changes
in dispersal of twospotted spider mites on
treated plants, reproductive rate of females
and development rate may contribute to
increases in populations that are higher than on
untreated plants. Also, twospotted spider mite
females will lay eggs in silks or on trichomes
(hairs) when residues of pyrethroid-based
pesticides are present on treated leaf surfaces.
Moreover, twospotted spider mite populations
on pyrethroid-based pesticide treated plants
may have a skewed sex ratio (more males
than females) than twospotted spider mites
on untreated plants if the pyrethroid-based
pesticide is more toxic to one sex than the other.
The response time affiliated with dispersal on
plant surfaces is dependent on the rate applied
and the pyrethroid-based pesticide used.
Also, the dispersal of twospotted spider mites
on plant surfaces may depend on the extent
of the repellent activity of pyrethroid-based
pesticides. In addition, the effect of pyrethroidbased
pesticides on twospotted spider mite
populations can vary depending on the product
used. For example, bifenthrin (Talstar) may
induce twospotted spider mite outbreaks
whereas tau-fluvalinate (Mavrik) may not
because Mavrik is a pyrethroid-based pesticide
with miticidal activity.
So, when applying certain pesticides, you
may want to consider the potential behavioral
effects, not only on the twospotted spider
mite, but also on other insect and mite pests of
greenhouse-grown horticultural crops including
aphids, broad mite, thrips and whiteflies.

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November/December 2022

Table of Contents for the Digital Edition of November/December 2022

November/December 2022 - 1
November/December 2022 - 2
November/December 2022 - 3
November/December 2022 - 4
November/December 2022 - 5
November/December 2022 - 6
November/December 2022 - 7
November/December 2022 - 8
November/December 2022 - 9
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November/December 2022 - 11
November/December 2022 - 12
November/December 2022 - 13
November/December 2022 - 14
November/December 2022 - 15
November/December 2022 - 16
November/December 2022 - 17
November/December 2022 - 18
November/December 2022 - 19
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November/December 2022 - 22
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