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INFLUENCE OF GRANARY TYPE AND FARM PRACTICES ON THE RELATIVE ABUNDANCE OF INSECTS IN GRANARY RESIDUES1

Published online by Cambridge University Press:  31 May 2012

P.S. Barker  and
L.B. Smith
P.S. Barker
Affiliation:
Agriculture Canada Research Station, 195 Dafoe Road, Winnipeg, Manitoba, Canada R3T 2M9
L.B. Smith
Affiliation:
Agriculture Canada Research Station, 195 Dafoe Road, Winnipeg, Manitoba, Canada R3T 2M9
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Abstract

The abundance of nine stored-product species found in crop residues in farm granaries in the Prairie Provinces was influenced by farm practices, kinds of crops stored in the granaries, and the materials used in the construction of the granaries.

Some species were found more frequently than expected on farms where there had been previous infestations (Pyralis farinalis L.), or where there was livestock (Cryptolestes ferrugineus [Stephens]).

Fewer samples than expected were found infested with Cryptophagus varus (W. & C.), where insecticidal sprays were used, but more C. ferrugineus than expected were found where fumigants or insecticidal sprays were used.

Fewer samples of canola residues than expected contained insects, but barley residues contained more insects than expected.

Wooden granaries contained more insects than expected, except for C. ferrugineus.

Cole’s coefficient of association showed that some species were often associated but other pairs of species such as Tribolium audax Halstead and Lathridius minutus L. were negatively associated.

These relationships between species and their environments can be used to reduce the abundance of stored-products insects in farm granaries.

Résumé

L’abondance de neuf espèces d’insectes associées aux résidus des récoltes agricoles entreposées dans les greniers des fermes des prairies était influencée par les pratiques agricoles, les genres de récoltes qui y étaient entreposées et par les matériaux qui ont été utilisés dans la construction des greniers.

Certaines espèces d’insectes ont été plus fréquemment retrouvées là où il y avait déjà eu des infestations (Pyralis farinalis L.) ou dans les greniers où il y avait eu des animaux (Cryptolestes ferrugineus [Stephens]).

L’utilisation antérieure d’insecticides a réduit la quantité d’échantillons infestés par le Cryptophagus varus (W. & C.), mais par contre plus de C. ferrugineus furent retrouvés là où les fumigants ou les insecticides ont été utilisés.

Moins de résidus de canola que prévu contenaient des insectes alors que les résidus d’orge en contenaient plus.

Les greniers de bois contenaient plus d’insectes que prévu, sauf pour C. ferrugineus.

Le coefficient d’association de Cole démontre que certaines espèces étaient souvent positivement associées alors que d’autres comme Tribolium audax Halstead et Lathridius minutus L. étaient négativement associées.

Ces relations entre des espèces et leur environnement peuvent être utilisées afin de réduire l’abondance des insectes des denrées entreposées dans les greniers de fermes.

Type
Articles
Information
The Canadian Entomologist , Volume 122 , Issue 3 , June 1990 , pp. 393 - 400
Copyright
Copyright © Entomological Society of Canada 1990

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