and purple scale (Lepidosaphes beckii Newm.). The outbreak of scales is associated with mild climatic conditions, especially high relative humidity in the air and. Lepidosaphes beckii (Newman) (Hemiptera: Diaspididae) seasonal abundance on sour-orange, Citrus aurantium trees was carried out in Kafr El-Sohaby, at. The ecology of the purple scale Lepidosaphes beckii (Newman) (Hemiptera: Diaspididae) was studied on citrus, in the area of Kalamata.
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Purple scale is one of the armored scales. The cover of the adult female purple scale resembles a mussel shell in shape.
The immature male cover is shorter and much narrower than the female cover. Mature males are winged insects that search out the immobile females.
After mating, females lay 40 to 80 eggs under the cover. After egg hatch, crawlers emerge from under the cover and settle on branches, twigs, leaves, or fruit and begin to form their covers.
They are covered with a mass of waxy threads until about half grown; at that time a brown cover with a purplish tinge forms. Two generations occur between May and October and a third may be partially completed before cold weather starts.
Purple scale is an occasional pest in certain coastal areas where the mild climate and humid conditions favor its buildup. It attacks all parts of the tree. Its feeding causes yellowish halos to becii on leaves; on young fruit, the feeding sites remain green.
When there are high numbers of scale, defoliation and twig dieback can occur; this usually takes place in limited patches on the lower north side of trees. Parasites usually provide good control of purple scale. Biological control may require supplementary insecticide applications at times, especially on dusty trees next to dirt roads. Controlling Argentine ants will also assist with purple scale biological control. The most effective purple scale parasite is Aphytis lepidosaphes, a parasitic wasp that is generally distributed in areas where purple scale occurs.
This parasite develops externally on the body of immature scales under the scale cover. Because this parasite is not commercially available, conserve naturally occurring populations of this beneficial in the grove. If insecticide applications are necessary, during August and September either spot treat i.
How to Manage Pests
bsckii This will assist in preserving natural enemies. Several predators including the twicestabbed lady beetleChilocorus spp. If a spray is needed, it may be sufficient to spot treat i.
Oil sprays for the California red scale also control the purple scale. Dunn, Badger Farming Co. Musgrove, retired entomologist, Riverside, CA K. For noncommercial purposes only, bekii Web site may link directly to this page.
Unfortunately, we cannot provide individual solutions to specific pest problems. See our Home pageor in the U. Agriculture and Natural Resources, University of California.
purple scale (Lepidosaphes beckii ) on citrus (Citrus spp. ) –
Description of the pest Damage Management. The following are ranked with the pesticides having the greatest IPM value listed first—the most effective and least harmful to natural enemieshoney beesand the environment are at the top of the table. When choosing a pesticide, consider information relating to air and water quality, resistance management, and the pesticide’s properties and application timing. Not all registered pesticides are listed.
Always read the label of the product being used. Apply higher rate of narrow range oil in July or Aug. Serious hazards are associated with oil sprays to green lemons because of phytotoxicity after sweating; check label for preharvest interval. For use on all varieties; however, it may cause ridging in lemons. Do not apply during Dec. See label for additional restrictions.
Highly toxic to bees; do not spray directly or allow to drift onto blooming crops or weeds where bees are foraging.
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Review the Department of Pesticide Regulation’s updated fact sheet. For use on all varieties.
Do not apply during bloom. May increase citrus red mite numbers.
Contact including smothering and barrier effects; also improves translaminar movement and insecticide persistence. Reducing the rate of carbaryl increases survival of natural enemies.
Resistance exists in some California red scale and Euseius tularensis predaceous mite populations. Reducing the beckil of the oil reduces the risk of phytotoxicity, especially in warmer growing areas of the state.