Tenthrède of wheat
Grain Growing Deserves Study, Francis J. S. Holmes. Extension Service, Manitoba Department of Agriculture and Immigration, 1940's
Archives du Manitoba, FC2147


This grub of the wheat stem saw fly was roused from hibernation in wheat stubble awaiting transformation to the fly stage in spring. Deposited in the straw as an egg then hatching out, knows how, after cutting off the stem above ground level, he manages to plug the open end for protection. Developed to resist the sawfly, the stem of Rescue wheat has no hollow space to accommodate the pest.

A crop in the bin is by no means safe from all hazards since these granary weevils and other insects can attack the grain in storage. Usually they're confined to elevators where grain is stored for fairly long periods. Some of our war time grain annexes were badly infested. Our commonest pest in this country do not cause as much damage as the granary weevil which simply hollows out the kernel of grain leaving nothing but a shell of bran.

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