November 2020 - 17

DR. BUGS
PARASITOIDS
COMMENTS
Encarsia formosa
A parasitoid used against the greenhouse
whitefly. Females prefer to lay eggs into
third- and fourth-instar nymphs. Adult
females feed on nymphs. Parasitized
whitefly pupae are black. Optimum
temperatures for regulating whitefly
populations are 68 to 77° F. Development,
from egg to adult, is completed in 14 days
at temperatures greater than 80° F. The
parasitoid is less effective in parasitizing
whiteflies on plants with trichomes (hairs)
such as cucumber.
Figure 3. Whitefly nymphs.
Eretmocerus eremicus
A parasitoid used against the greenhouse
and sweetpotato whitefly. Females prefer
laying eggs into second- and thirdinstar
nymphs. Adult females will feed on
nymphs. Eretmocerus eremicus tolerates
higher temperatures than Encarsia
formosa.
PREDATORS
COMMENTS
Delphastus catalinae
A predatory ladybird beetle in which both
the larvae and adult feed on whitefly
eggs and nymphs. Adults will feed on
greenhouse and sweetpotato whitefly but
prefer sweetpotato whitefly. Females lay
between 200 and 300 eggs during their
lifetime. Adults live between 45 and 60
days. A single adult can feed on 160 eggs
per day. Adults do not feed on parasitized
whiteflies.
release rates that are required to regulate whitefly
populations. The biological control agents that are
commercially available for use against whiteflies
are presented in Table 1.
For more information on the management
of whiteflies in greenhouse production
systems using biological control agents,
and images of the four biological control
agents discussed in Table 1, download the
following Extension publication: " Whiteflies:
Management in Greenhouse Production
Systems " available at www.bookstore.ksre.ksu.
edu/pubs/MF3532.pdf.
BOOTH #0106
www.ipmlabs.com * 315 497 2063
ipminfo@ipmlabs.com
Amblyseius swirskii
A predatory mite that feeds on whitefly
eggs and nymphs and will feed on
pollen as an alternative food source
if no whiteflies are present. Optimum
temperatures for regulating whitefly
populations are 77 to 83° F. The life cycle,
from egg to adult, can be completed in less
than seven days. Amblyseius swirskii is less
effective in regulating whitefly populations
on plants with trichomes (hairs) such as
tomato.
Table 1. Commercially available biological control agents (parasitoids and
predators) for use against whiteflies in greenhouse production systems.
Biological
controls for
Aphids, Thrips,
Fungus Gnats,
Spider Mites,
Whiteflies and more...
APHID GUARDTM
Banker Plant
GREENHOUSE PRODUCT NEWS 17

http://www.bookstore.ksre.ksu http://www.ipmlabs.com

November 2020

Table of Contents for the Digital Edition of November 2020

November 2020 - 1
November 2020 - 2
November 2020 - 3
November 2020 - 4
November 2020 - 5
November 2020 - 6
November 2020 - 7
November 2020 - 8
November 2020 - 9
November 2020 - 10
November 2020 - 11
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