Annual Report of the Agricultural Experiment Station of the University of Minnesota, Թողարկում 93-96Pioneer Press Company, 1906 |
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adult Aldrich animals antennae ASILIDAE attack autumn beautiful bot fly breeding bulletin Cabbage Maggot cattle cent Chironomid color common complete fertilizer corn covering crops cultivated Diptera eggs enlarged entomologist eradicate Experiment Station female field flies foliage fruit genus germinate Golden Willow grain growing grown growth H. D. Ayer habit hairs hardy Hessian Fly horse house fly infested injury insects killed known large number larva larvæ lawn LEAF Lilac Linn live Loew loss of nitrogen Lugger Macq maggots Maple Minnesota Minnesota species mosquito native nitrogen North America Nursery ornamental ornamental planting parasites pest phosphate phosphoric acid plants plot receiving plowing potash pretty produced protection in winter pupa quack grass root stalks rose rotation sheep shown in Fig shrub soil specimens Spirea spring Spruce stems Stratiomyida straw tion tree variety weed seeds wheat white flowers Willow wings yellow yield
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Էջ 171 - ... into the surface pores. This permits partial impregnation of the rock fragments and results in a greater cohesion of the materials of the road as a whole. Relatively high toughness and hardness values are also desirable. The minimum limits of physical tests of rock for bituminous road construction, are given in the following table. It is to be noted that the recommendations for stone to be used in bituminous concrete are obtained from different sources as indicated.
Էջ 139 - ... reported to the editor of Insect Life, some years ago, that while in the forests of the United States of Colombia looking for mahogany, far from cattle or the habitations of men, he was much troubled by bots living under the skin of his back and shoulders. Mr. John Hamilton, in the Entomological News Vol. 4, claims that in South America the bot fly, which he at the time recorded as Oestrus hominis, deposited eggs under the skin of the bellies of the natives, and the larvae sometimes produced...
Էջ 99 - ... months old, very fat and fleshy; let a number of young men kill him by beating him violently with clubs, so as to mangle both flesh and bones, but taking care not to shed any blood; let all the orifices, mouth, eyes, nose, etc., be stopped up with clean and fine linen, impregnated with pitch; let a quantity of thyme be strewed under the reclining animal, and then let windows and doors be closed and covered with a thick coating of clay, to prevent the access of air or wind. Three weeks later let...
Էջ 36 - I'll tell you why, Although it gives me pain. For years I cannot hum a bit, Or sing the smallest song ; And this the dreadful reason is, My legs are grown too long ! My six long legs, all here and there, Oppress my bosom with despair...
Էջ 61 - If the stubble is left long it will burn easier. Some farmers are willing to go to the trouble of spreading straw from threshing over the stubble, thus insuring the burning and at the same time getting rid of some "flax seeds" which may have lodged on the surface of the straw pile at the time of threshing.
Էջ 75 - Lugger. struct for this purpose a neat little cradle-like house, made loosely of silk, and open at the top. This cradle is built against a stone, or upon submerged plants. In it the larva fastens itself by a little loose silk in the closed part, and now transforms to a pupa, and again removed from the cradle. But a great change has taken place, and the insect no longer breathes through an organ located near the tail, but by an entirely different one near the head. These breathing organs differ greatly...
Էջ 90 - Bombyliids do not use their proboscids for anything but sipping nectar or gathering pollen, but the writer has been quite severely "bitten" by them, and his experience was duplicated by Dr. Lugger, who says, in discussing this useful parasite, on page 43 of the Third Annual Report, speaking of the above species: "This proboscis can be used for other purposes than sipping nectar, as the writer found out to his sorrow, when he attempted to catch some of them with his hand and succeeded. Violent pain,...
Էջ 73 - In our lake regions we find a large number of streams that flow over rocky bottoms, and are obstructed by floating grasses and other submerged plants. When we see a place in which the water flows more rapidly than in others, we can be certain to find there the early stages of buffalo-gnats. By investigating the plants that cause an obstruction, we find large numbers of larvae and pupae fastened to them. * * * This latter species (S.
Էջ 61 - Burn the stubble when, from any reason, shallow plowing is unavoidable, or when plowing is to be delayed in the spring until after emergence of flies. If the stubble is left long it will burn easier. Some farmers are willing to go to the trouble of spreading straw from threshing over the stubble, thus insuring the burning, and at the same Fig. 48. Different...
Էջ iii - SIR : I have the honor to transmit to you herewith the annual report of the National Academy of Sciences for the fiscal year which ended June 30, 1958.