Bulletin, Edició 2U.S. Government Printing Office, 1895 |
Altres edicions - Mostra-ho tot
Frases i termes més freqüents
abundant Albany apparatus applied arsenate of lead arsenite arsenite of copper association attack bark beetles bisulphide borer bulletin C. L. MARLATT caterpillars cent chinch bugs coccids collection crayfish defoliated dendrolene Department of Agriculture destroyed destruction early spraying economic entomologist effect eggs elm leaf-beetle Experiment Station extermination fact Fernald field foliage forest gallons of water gauge ground growers gypsy moth habits Hessian fly holes Howard importance infested injury insecticide Jersey July kerosene emulsion killed larva larvæ lead acetate leaf lime Lintner manufacture Marlatt Massachusetts matter method mixture nearly nozzle nun moth nurseries nurserymen occurs Ohio orchard paper parasites Paris green parks pear pest plants pounds present probably pump pupa pupation raupenleim ravages referred remedy Riley San Jose scale scale insects season second brood shade trees shade-tree insects Smith soap Southwick species specimens spread Springfield substances timber tion trunk Washington willow
Passatges populars
Pàgina 5 - VI. AMENDMENTS Amendments, after having been approved by a majority of the Executive Committee present at a meeting regularly called, may be adopted by a majority vote of the members present at any regular meeting of the Association.
Pàgina 76 - Columbian timber bpetle, all of which attack living trees, will equal that caused by many forest conflagrations. Then when we come to consider the damage to the wood of dying, dead and felled timber, and the work of destruction only begun by fire and completed by wood-boring species, it appears to us that the damage caused by insects is at least equal to that caused by fire. There is also another feature of the question, and that is in reference to the effect of the detrimental and destructive ravages'...
Pàgina 5 - ... 3. The membership shall be confined to workers in economic entomology. All economic entomologists employed by the general or State Governments, or by the State Experimental Stations, or by any agricultural or horticultural association, and all teachers of economic entomology in educational institutions, may become members of the Association by transmitting proper credentials to the Secretary, and by authorizing him to sign their names to this constitution.
Pàgina 29 - ... through it, the stopcock being wide open. By partly turning off the stopcock the proportion of kerosene can be reduced at pleasure, and the percentage may be indicated by graduations on the back part of the stopcock. For Paris green, make up a pailful at the rate of 1 pound to 25 gallons of water, and when drawn through the machine it will be diluted at the 8 per cent kerosene gauge mark to 1 pound to 150 gallons and thoroughly mixed. The device was experimented with by the inventor with a water...
Pàgina 5 - The officers shall consist of a President, two Vice-Presidents and a Secretary, to be elected annually, who shall perform the duties customarily incumbent upon their respective offices. The President shall not hold office for two consecutive terms.
Pàgina 54 - Effect« of the Poison. — In this grove the elms that were poisoned in 1882 were attacked in the spring of 1883 less severely than were those which were not poisoned the previous year. This would seem to imply that the insects deposit mostly on the trees nearest to where they develop, and are only partially migratory before ovipositing.
Pàgina 67 - ... alkaline liquid he had considered the cyanides of different metals to be the most promising. The cyanides of lead, antimony, copper, zinc, iron, manganese, mercury, etc., were considered. The cyanides of antimony and copper, on theoretical grounds, seemed to promise best. The cyanide of antimony was totally without effect at the rate of 10 pounds to 150 gallons of water. Cyanide of copper was fairly effective, but too expensive for practical employment...
Pàgina 2 - The San Jose Scale : its occurrences in the United States with a full account of its life history and the remedies to be used against it.
Pàgina 81 - ... have destroyed the pest on their own, most men will see at once that it is the least expensive way out of the trouble. I am satisfied that there is a method of procedure that will work the least hardship to the deserving, yet will compel the stubborn to keep infection confined to their own premises and stamp it out there as soon as possible. I believe that we hold the balance of power, so to speak, and need not barter our influence, but hold it to be sought for by those who wish to escape with...
Pàgina 80 - ... follows that it will be the last. It is all right to study the biology of the insect, and this is really the first step to be taken, but the duty of the economic entomologist does not stop there by any means. The man who has been unfortunate enough to get the thing in his orchard wants to know all he can learn about it, but the one who is free of it would vastly more like to know how to keep free of it. Some of you are aware that I am not in the least in sympathy with the manner in which we have...