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1 April 2005 Hot Water Immersion for Surface Disinfestation of Maconellicoccus hirsutus (Homoptera: Pseudococcidae)
Arnold H. Hara, Christopher M. Jacobsen
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Abstract

Mealybug Maconellicoccus hirsutus (Green) adults, nymphs, crawlers, and eggs were tested for their susceptibility to hot water immersion at 47, 48, and 49°C. Eggs inside ovisacs were found most tolerant with prolonged survival compared with other stages at all temperatures. Ovisacs required an average of 1.38, 1.46, and 1.62 times longer treatment duration than adults, nymphs, and crawlers, respectively, for 99.9% predicted mortality at 47, 48, and 49°C. Lethal time estimations were calculated from inverse predictions of regressions derived from logit-transformed data as well as those created using a kinetic model. LT 99.9 estimations were 47.0, 21.2, and 11.9 min at 47, 48, and 49°C, respectively, by using regressions with logit transformations. The kinetic model predictions were 43.9, 19.6, and 11.1 min at 47, 48, and 49°C, respectively. During the study no emergence from eggs inside ovisacs was found after treatments of 52, 24, and 14 min at 47, 48, and 49°C, respectively. Results from this study provide efficacious temperature–time treatments.

Arnold H. Hara and Christopher M. Jacobsen "Hot Water Immersion for Surface Disinfestation of Maconellicoccus hirsutus (Homoptera: Pseudococcidae)," Journal of Economic Entomology 98(2), 284-288, (1 April 2005). https://doi.org/10.1603/0022-0493-98.2.284
Received: 3 August 2004; Accepted: 1 November 2004; Published: 1 April 2005
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