บทคัดย่องานวิจัย

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High-temperature controlled atmosphere and air treatments to control obscure mealybug (Hemiptera: Pseudococcidae) on apples.

Whiting, D.C.

Journal of economic entomology.Apr 1997. v. 90 (2) (ABBREV TITLE = J. econ. entomol.)

1997

บทคัดย่อ

High-temperature controlled atmosphere and air treatments to control obscure mealybug (Hemiptera: Pseudococcidae) on apples.

Obscure mealybug, Pseudococcus affinis (Maskell), life stages infested on apples were exposed to various concentrations of O2 (0.4-20.9%) at high temperatures (35-45 degrees C) and mortality was determined. Results showed that the time for 99% mortality (LT99) reduced with increasing temperature and decreasing O2 concentration (35 and 40 degrees C only). Life stage differences at these temperatures (female adults more tolerant than all instars) were distinguishable only in air (20.9% O2). Exposure to the lowest O2 concentration tested (0.4% O2) at 35 and 40 degrees O2 resulted in the lowest mean LT99s (12.4-14.8 and 8.3-9.7 h, respectively). At 45 degrees C, the effect of reducing O2 concentration was diminished, and no life stage differences were evident. At this temperature, maximum mean LT99s ranged from 4.9 (0.4% O2) to 8.2 (20.9% O2) h.