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Develop an economic injury level for cottony cushion scale in mature navels
Develop a user-friendly sampling method for cottony cushion scale.
Develop a sampling method for vedalia beetle
Determine the upper and lower developmental threshold of vedalia beetle
By May 15 to June 15 (depending on temperature), all of the adult female scales die, scale populations are primarily 1st instars which are not suitable for vedalia egg laying, and summer heat arrives and suppresses vedalia. We documented a reduction in vedalia egg laying, egg hatch, and larval survival when exposed to temperatures of 93 to 100 degrees Fahrenheit.
Our data suggests that growers should move vedalia into their orchards in March, and if for some reason vedalia do not control the scale, wait until the vedalia is no longer effective and the scale stages are primarily 1st instars (June) to use insecticides. There are three generations of scale per year, however, the spring generation shows the greatest growth.
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Statewide IPM Program, Agriculture and Natural Resources, University of California
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