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Lindorus lopanthae Scale
Predator PO Box 1555, Ventura, CA 93002 800-248-2847 * 805-643-5407 * fax
805-643-6267 bugnet@rinconvitova.com web http://rinconvitova.com |
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Lindorus
lopanthae (some call Lindorus) are
tiny coccinellid beetles that devour many types of scale. They are valuable
for being able to chew through hard scale as well as eat eggs and immatures
of hard and soft scale. They are used in orchards, landscapes, Christmas tree
farms, greenhouses and interiors. With ample food, light and moisture
Lindorus beetles begin reproducing immediately. |
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HANDLING
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Release as soon as
possible. Until then, keep cool and ideally in a dark place to slow their
metabolism.
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Do not store in
household refrigerator. They are susceptible to freezing.
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Beetles are best
released in high-density patches of reproducing scale that can become “Lindorus
field insectaries”. Their offspring will spread out from those first sites
searching for more patches of scale.
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Releases outdoors are
best made late evening.
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Ant interference is a
factor, but Lindorus can sustain their populations on the ant infested trees
attacking the scale on the trunks and gray wood branches where ant trails
foster high populations of scale insects.
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Honeydew on leaves
hinders movement of adults and larvae. Spray leaves with water to remove
honeydew before releasing beetles.
BIOLOGY
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This ladybug beetle
is black with an orange colored head and thorax. Adults are larger than
Stethorus spidermite destroyers, but smaller than aphid-eating Scymnus and much
smaller than Cryptolaemus mealybug destroyers.
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The forewings,
elytra, are metallic black and clothed with grayish or light brown hairs.
Prothorax is brown with a faint darker horizontal band across the middle. The
ventral surface and legs are brown.
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The ladybugs
generally live up to a year laying 60 to 100 eggs when they find hot spots of
reproducing scale. Feeding on crawlers stimulates egg laying. One or two eggs
are found beneath the scale. They are oval, white and with a metal iridescence.
They are attracted to hot spots of scale where they deposit eggs before
resuming search for scale. They will lay eggs in mealybug masses, but that is
not a preferred host.
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Larvae consume the
scale under which they were deposited and then move on to attack many more
scale until reaching maturity. They eat out an irregular hole in the scale
covering. The mature larva is 4 mm long, dark gray with a lighter rectangular
area on the dorsal line of the first four abdominal segments. There is also a
strip of similar color on either side of the dorsal line on the thorax, and two
narrower strips more laterally on the last four abdominal segments.
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Beetles have been
observed active at temperatures as low as 40° F and as high as 100oF. The warmer the weather,
the more reproductive.
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Works well with other
beneficial insects including Aphytis.
RELEASE RATE AND
FREQUENCY
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Suggested release
rates are 2-6 beetles/m2 (10 ft2) or 2-5 beetles/infested
plant, weekly or biweekly, or 10-40 adults per tree depending on how fast you
want to achieve control.
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Adult beetles
released at 10 adults per infested tree form a colony for inoculation purposes.