Journal of Economic Entomology (2015) 108, 2471-2478

Fuji Jian, Paul G. Fields, Kelsey Hargreaves, Digvir S. Jayas and Noel D.G. White (2015)
Chill-coma and minimum movement temperatures of stored-product beetles in stored wheat
Journal of Economic Entomology 108 (5), 2471-2478
Abstract: The minimum temperature at which stored-product insects can move inside stored grain bulks with different grain moisture contents is not known. The movement of adults of four stored-product insects, Cryptolestes ferrugineus (Stephens), Tribolium castaneum (Herbst), Sitophilus oryzae (L.), and Sitophilus zeamais (Motschulsky), at low temperatures inside jars or bulks of wheat with 11.1 or 16.0% moisture content was measured. Spontaneous walking stops (SM_h), CCT (no movement after shaken), and minimum movement (TM_min, caught in probe pitfall traps) temperatures were determined at stepped-decrease of temperature. The ranges of SM_h, CCT, and TM_min temperatures of the four stored-products beetles were 4.0 to 9.0°C, 2.0 to 8.0°C, and 6.0 to 11.5°C, respectively. The TM_min was ~3°C higher than the SM_h for all the tested beetles. C. ferrugineus had the lowest SM_h, CCT, and TM_min temperatures, whereas S. zeamais had the highest values of these determined temperatures. C. ferrugineus under a faster stepped-decrease of temperature had higher SM_h, CCT, and TM_min temperatures than that under a slower stepped-decrease of temperature, while adults of T. castaneum were not influenced by the temperature decrease rate. The two species of Sitophilus did not survive to the end of the experiment at the faster stepped-decrease of temperature. Two grain moisture contents did not affect these determined temperatures for all tested species.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website
Database assignments for author(s): Digvir S. Jayas, Paul G. Fields

Research topic(s) for pests/diseases/weeds:
environment - cropping system/rotation
control - general

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Tribolium castaneum	Stored grain
	Sitophilus oryzae	Stored grain
	Sitophilus zeamais	Stored grain
	Cryptolestes ferrugineus	Stored grain