Natural size and magnified.
1, Anchor-process of larva of Cecidomyia destructor; 2, of Cecidomyia trilici—magnified; “flax-seeds,” or puparia, in different stages of development, natural size and magnified.
FIG 15.—HESSIAN FLY, CECIDOMYIA DESTRUCTOR.
August 22, 1894.
I have to-day had a request from Dr. Ritzema Bos for some specimens of Hessian fly puparia in situ or otherwise. If you could do it without inconvenience, could you oblige me with some “flax-seeds” if you come on them at threshing time; and you will be good enough to let me have also a few pieces of barley or wheat stem just three or four inches long with the flax seed still adhering.
I hope you are having good harvest weather, but indeed this is the first really good bright summer’s day we have had for a long time, and to my eye the wheat round here has a grey look instead of the bright colour.
FIG. 16.—YOUNG WHEAT, WITH HESSIAN FLY MAGGOT AT “a.”
(After Prof. Webster.)
1, Straw bent over;
2, showing “flax-seeds.”
HESSIAN FLY ATTACK ON BARLEY.