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Entomology – Page 2

2005 Morse/Luck ( Survey for Soft Scale Parasitoids in Interior Southern California)

Survey for Soft Scale Parasitoids in Interior Southern California

This project seeks to improve the biological control of black scale in southern California and of citricola scale in the San Joaquin Valley (SJV). To do so, we need to better understand which parasitoids attack black scale during the year in southern California and which species in the complex are responsible for the near elimination of citricola scale in this region. We will contrast this information with that from the SJV, where citricola scale remains a significant problem.

2005 Morse/Luck/G-Cardwell (Integrating Chloronicotinyl Pesticides with Red Scale Biological Control)

Integrating Chloronicotinyl Pesticides with Red Scale Biological Control

This project investigates the impact of a glassy-winged sharpshooter (GWSS) treatment of Admire and a Citricola scale treatment of Assail on the natural enemies suppressing California red scale (CRS) in the San Joaquin Valley (SJV), including Aphytis melinus releases. Before GWSS, Aphytis released argumentatively in association with resident natural enemies effectively suppressed CRS. This project interfaces with Grafton-Cardwell’s CRB project: “Long-term effects of chloronicotinyls on citrus IPM”.

2005 Robert Luck (Infrastructure for Armored Scale Research)

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2005 Beth Grafton-Cardwell (Evaluation of the Effects of Micromite)

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2005 Beth Grafton-Cardwell (Monitoring for Pesticide Resistance in California Red Scale)

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2005 Beth Grafton-Cardwell (Long Term Effects of Chloronicotinyls on Citrus IPM)

Long-term Effects of Chloronicotinyls on Citrus IPM

Our goal is to assess the impact of Assail on citrus IPM when applied in April-May as a glassy-winged sharpshooter (GWSS) treatment, June as a red scale treatment, or August as a citricola scale treatment. We are also evaluating Admire in April or May as a GWSS treatment. In each block, there were three 6-acre treated replicates and three 6 acre untreated replicates arranged in a checkerboard fashion in four Paramount citrus orchards in Kern County.

2008 Robert F Luck (Infrastructure of Armored Scale Research)

Infrastructure for Armored Scale Research

This project seeks to foster research by UC Riverside and industry scientists by providing various armored scale, their associated parasitoids, and assistance in experimental design to achieve this goal. California red scale (CRS) remains a key pest of citrus in the San Joaquin Valley and in the desert. This project’s mission is to support all aspects of armored scale pest management strategies. As new pests enter California citrus, CRS research must modify control tactics that can integrate into new pest management practices.

2008 Mark Hoddle (Survey of Neohydatothrips)

Survey for Neohydatothrips burungae on California Citrus

Neohydatothrips burungae, a thrips native to Mexico, Central, and South America, was discovered for the first time attacking lemons in Ventura County in May 2007. The potential threat that this new thrips pest poses to California citrus is currently undetermined; its range in California grown citrus is not known; and, potential quarantine issues for fruit exports could arise because of this insect.

2008 Luck and Morse (Rearing Leafminer Parasitoids)

Seasonal Phenology of Citrus Leafminer; Rearing Parasitoids of Both Citrus Leafminer and Peelminer

Citrus leafminer (CLM) is now established throughout California citrus growing regions. In certain citrus varieties in the San Joaquin Valley (SJV), citrus peelminer (PM) has become economic, as it has in the Coachella Valley. CLM is economic only on non-bearing citrus as the larvae mine the new flush, causing stunting and leaf drop. Conversely, PM is economic on bearing citrus as the larvae mine mature fruit, causing irreversible cosmetic damage.

2008 Luck and Morse (Parasitoid of Citricola)

Parasitoid Preference for Citricola Scale in Southern CA vs. San Joaquin Valley Citrus

Citricola scale has re-emerged as a key pest due to the reduced use of organophosphates and carbamates in the San Joaquin Valley (SJV). The availability of these compounds to manage citricola scale may decrease because of new regulations that govern Pesticide’s Volatile Organic Compounds (VOCs) as air pollutants. In addition, resistance to Lorsban is developing in some areas. Therefore, there is renewed interest among growers in establishing a long-term, biological control solution to the citricola scale problem in the SJV.