Past Research – Page 3

2005 David Haviland ( Survey for Woolly Whitefly in Kern County )

Survey for Woolly Whitefly in Kern County

Woolly whitefly is an established pest of citrus in southern and coastal citrus production regions of California. In those areas, it is naturally suppressed below economically damaging levels by parasitic wasps. Woolly whitefly has recently been introduced into the southern San Joaquin Valley in residential areas in northeast Bakersfield, Kern County. It appears, however, to have become introduced without the parasitic wasps known to control it in other portions of the state. As a result, woolly whitefly is quickly becoming established and spreading throughout urban areas of Bakersfield, and if left unabated has the potential to move into citrus production regions of Kern and neighboring counties.

2005 Joseph Morse ( Management of Bean Thrips)

Management of Bean Thrips Joseph Morse

Bean thrips are an economic problem for California citrus growers only because adults will overwinter in the navel of navel oranges and may be detected in Australia where they are considered a quarantine pest resulting in the entire load being fumigated with methyl bromide. In addition to the cost and fruit damage from such treatments, Australia has indicated that unless progress is made in reducing finds, more severe penalties may result. It is possible that other countries may eventually consider bean thrips a quarantine risk.

2005 Joseph Morse ( Management of Citrus Thrips)

Management of Citrus Thrips

Citrus thrips populations vary from year to year and require that growers and pest control advisors monitor carefully and apply treatments on an as- needed basis. A number of natural enemies (e.g., Euseius tularensis, spiders, lacewings) assist in reducing citrus thrips numbers, but in some years citrus thrips levels exceed treatment thresholds and lead to economic fruit scarring unless corrective measures are applied.

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.

2005 Robert R. Krueger Final Report (Stubborn Disease in the Field)

Development of a Rapid System for Detection of Stubborn Disease in the Field

Stubborn disease of citrus, caused by Spiroplasma citri, is an important disease of citrus in the hot, arid inland areas of California and Arizona. The two methods most commonly used for detection of stubborn have been biological indexing and culture in a cell-free medium. Indexing for stubborn disease of citrus is difficult since it requires the somewhat tricky side-graft or leaf vein method, and it takes several months to obtain results. Culturing is also somewhat time consuming, sometimes requires several attempts, and can produce false positives from contamination. Culturing is the test of record for CDFA and most regulatory agencies.