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Walnut Blister Mite
University of California IPM — The walnut blister mite occasionally occurs in walnut orchards. Adult mites are very small and cannot be seen without a 14 to 20X hand lens. They have a white, slender, striated body with a few long hairs. Immature forms resemble adults but are ...More…
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Monitoring And Treating Insects And Mites
University of California IPM — UC Management Guidelines for Monitoring And Treating Insects And Mites on Turfgrass. It is important to accurately identify insects found in turfgrass stands because many of them are not pests. In addition, the most effective treatment for one ...More…
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General Properties And Use Of Fungicides
University of California IPM — The fungicide products mentioned in this section are registered for use on turfgrass in California, but many have not been evaluated by the University of California for their effectiveness in controlling turfgrass diseases. The fungicides are ...More…
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Weed Management in Organic Orchards
University of California IPM — Information about Weed Management in Organic Orchards in Olive. Weed control in organic farming systems combines many techniques to reduce weed pressure by preventing weed seed germination and propagule development. In addition to controlling ...More…
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UC Management Guidelines for Root Weevils on Olive
University of California IPM — Cribate weevil adults are dark brown with longitudinal striations. The black vine weevil adult is black with small patches of white scales. Both are about 0.5 inches (12.7 mm) long. They are flightless and nocturnal. The adults, nearly all ...More…
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UC Management Guidelines for Olive Psyllid on Olive
University of California IPM — The olive psyllid can be found in San Diego and Orange Counties. Olive psyllid feeds on olive, Russian olive (Elaeagnus angustifolia) and mock privet (Phillyrea latifolia). Light green and tan adults are 2.5 mm long and strong jumpers. In olive ...More…
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Tospoviruses
University of California IPM — Tomato spotted wilt virus and Impatiens necrotic spot virus are closely related tospoviruses that cause indistinguishable symptoms in lettuce. Leaves of infected plants develop brown to dark brown spots and dead (necrotic) areas. Necrotic tissue ...More…
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Pathogen: none (abiotic disorder)
University of California IPM — Tipburn is characterized by browning of the margins of young, maturing leaves in head and leaf lettuces. The brown area may be limited to a few small spots at or near the leaf margin, or the entire edge of the leaf may be affected. Many pinpoint ...More…
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Ammonium Toxicity
University of California IPM — Aboveground symptoms on lettuce caused by free ammonia in the soil are similar to those caused by root injury: dull, dark green or gray-green leaves, temporary leaf wilting, desiccation, and yellow V-shaped sections. The symptoms may progress, ...More…
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Practices for Control of Soluble Nutrients and Pesticides
University of California IPM — UC Management Guidelines for Measures To Minimize Water Quality Impairments To Surface And Ground Water on Lettuce. Because lettuce yield is reduced by mild deficits in soil moisture, the crop is often excessively irrigated, which may cause ...More…
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Irrigation Of Head And Romaine Lettuce
University of California IPM — UC Management Guidelines for Irrigation Of Head And Romaine Lettuce on Lettuce. Head lettuce requires sufficient water to replenish moisture lost through evapotranspiration (ET). Irrigation also serves to cool the crop during hot weather through ...More…
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Fertilization
University of California IPM — Most agricultural soils in California contain sufficient potassium (K) and micronutrients to produce a lettuce crop. Most soils will require phosphorus fertilization, although in fields with a history of heavy phosphorus (P) applications, ...More…