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Insects 2018, 9(2), 45;

Oxygen Consumption and Acoustic Activity of Adult Callosobruchus maculatus (F.) (Coleoptera: Chrysomelidae: Bruchinae) during Hermetic Storage

Department of Entomology, Purdue University, 901 W. State Street, West Lafayette, IN 47907, USA
United States Department of Agriculture, Agricultural Research Service Center for Medical, Agricultural and Veterinary Entomology, 1700 SW 23rd Dr, Gainesville, FL 32608, USA
Author to whom correspondence should be addressed.
Received: 29 March 2018 / Revised: 18 April 2018 / Accepted: 19 April 2018 / Published: 20 April 2018
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Acoustic monitoring was applied to consider hermetic exposure durations and oxygen levels required to stop adult Callosobruchus maculatus activity and economic damage on cowpea. A 15-d study was conducted with six treatments of 25, 50, and 100 C. maculatus adults in 500 and 1000 mL jars using acoustic probes inserted through stoppers sealing the jars. Acoustic activity as a result of locomotion, mating, and egg-laying was measured by identifying sound impulses with frequency spectra representative of known insect sounds, and counting trains (bursts) of impulses separated by intervals of <200 ms, that typically are produced only by insects. By the end of the first week of storage in all treatments, oxygen levels declined to levels below 4%, which has been demonstrated to cause mortality in previous studies. Concomitantly, insect sound burst rates dropped below an acoustic detection threshold of 0.02 bursts s−1, indicating that the insects had ceased feeding. Statistically significant relationships were obtained between two different measures of the acoustic activity and the residual oxygen level. Based on the experimental results, a simple equation can be used to estimate the time needed for oxygen to decline to levels that limit insect feeding damage and thus grain losses in hermetic storage containers of different insect population levels and various volumes. View Full-Text
Keywords: cowpea weevil; detection; mortality; hermetic; postharvest cowpea weevil; detection; mortality; hermetic; postharvest

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Njoroge, A.W.; Mankin, R.W.; Smith, B.W.; Baributsa, D. Oxygen Consumption and Acoustic Activity of Adult Callosobruchus maculatus (F.) (Coleoptera: Chrysomelidae: Bruchinae) during Hermetic Storage. Insects 2018, 9, 45.

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