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CUCUMERIS [Amblyseius
(=Neoseiulus) cucumeris] Thrips
Predator by Applied Bio-nomics PO Box 1555, Ventura, CA 93002 800-248-2847 *
805-643-5407 * fax 805-643-6267 questions bugnet@rinconvitova.com orders
orderdesk@rinconvitova.com www.rinconvitova.com |
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Target pests
Western
flower thrips (Frankliniella
occidentalis), Onion thrips (Thrips
tabaci)
Cyclamen
and broad mites
Description
‘Cucumeris’
is a species of predatory mite that feeds on immature stages of thrips. It also
feeds on pollen, two-spotted mites and other species of mites.
·
Cucumeris adults are pear-shaped, tan colored mites, less
than 0.5 mm (1/50 inch) long.
·
Eggs are round, transparent and 0.14 mm (0.01 inch) in
diameter.
Use in
Biological Control
·
Cucumeris is mainly used to control western flower thrips,
with great success on greenhouse sweet peppers.
·
Optimum conditions are 20-25C (68-77F) with relative humidity 66-70%.
Monitoring
Tips
Use
a 10-15 X hand lens to inspect for mites, which are most often found along
veins on the underside of leaves or inside mature flowers.
Life Cycle
A
complete life cycle takes 10-12 days at 20C (68F).
·
Cucumeris populations have somewhat more females than males
(64% females).
·
Females lay 1-3 eggs per day for an average of 35 eggs over
their lifetime. Eggs are laid on leaf hairs along the veins on the lower
surface of leaves. They hatch in about 3 days.
·
Newly hatched larvae do not feed until they moult at 2 days
old. They feed for another 7 days before becoming adults.
·
Adults live for up to 30 days and eat an average of 1
thrips/day.
Although
in northern climates, outdoor populations of Cucumeris diapause in response to
short days, the Cucumeris now sold for greenhouse use are non-diapausing
strains and may be used year round.
Product
Information
Cucumeris
adults and immatures are shipped mixed with a bran carrier. They are available
in two types of packaging:
·
Bulk cartons, containing 10,000 - 50,000 predators. The
contents are gently shaken onto leaves throughout the greenhouse or placed on
the rock wool block or growing media in contact with the plant stem. Upon
receipt active predators should be visible at the top of containers at room
temperature.
·
Slow release bags, containing approximately 30 mL (1/8 cup)
of carrier with predators and a food source. The bags act as miniature breeding
units and are hung on plants throughout the greenhouse. Over four weeks, each
bag can produces over 1000 predators under good conditions.
Introduction
Rates
Relatively
high introduction rates are required because thrips can reproduce nearly twice
as fast as Cucumeris, and Cucumeris only feeds on immature thrips, not adults.
General
Introduction Rates
·
10-100 Cucumeris/ plant, weekly, as needed.
·
As a starter culture for young plants, place 25
Cucumeris/plant at the base of the stem at soon as they are planted out in the
greenhouse.
Using
the Bulk Product
·
Greenhouse peppers –
10 Cucumeris/plant. This is sufficient early in the growing season if
pollen is available as an alternate food source.
·
Greenhouse cucumbers – 50-100 Cucumeris/plant, weekly, until
the percentage of leaves with predators is greater than that with thrips.
·
Greenhouse tomatoes –
25 Cucumeris/plant, weekly, for two weeks, when thrips are detected.
Using
Slow release bags
·
Greenhouse cucumbers –
1 bag/5 plants every 1-2 weeks, until there is 1 bag/plant in infested
areas
·
Interior plantscapes –
1 bag/large plant, every 6-8 weeks
Hang
bags within 25 cm (10 inches) of the growing point on greenhouse crops,
ensuring good contact with the stem and leaves. Bags should not be exposed to
direct sunlight or overhead watering.
Establishment
of Cucumeris requires 4-8 weeks, so it should be applied before thrips problems
develop. Because Cucumeris feed only on immature thrips stages, a decrease in
adult thrips populations will not occur for about 3 weeks.
For Best
Results
·
Where Persimilis is being used for control of spider mite,
avoid heavy applications of Cucumeris. Cucumeris feed on spider mite eggs,
which may limit the food supply for immature Persimilis and reduce their
effectiveness.
·
Use Cucumeris along with other thrips predators such as
Orius spp. on flowering plants and Hypoaspis to control thrips pupae in the
growth media.
·
Plant dill, coriander or other flowers for nectar source to
draw Orius and other beneficials in field settings
Using
Pesticides
Some
insecticides and fungicides can be used with Cucumeris.
Use
of any water-based sprays with spreader stickers will kill some predators and
wash them off the leaves.
There
are no selective pesticides that will kill thrips and not harm Cucumeris,
however, insecticidal soap sprays may be used in hot spots and will not leave
harmful residues. Experience has shown that endosulfan (Thiodan®),
used once at ˝ label rate will reduce thrips numbers, but not kill all
Cucumeris, thus allowing them to re-establish on the crop.