92 



The principal articles are upon experiments in preventing the injuries 

 of the Plum Curculio; a practical preventive of Eose Bug injuries to 

 grapes and peaches; on some insects affecting Currants and Goose- 

 berries ; notes on some Baspberry Insects ; on the autumn life-history 

 of certain little-known Plant-lice; notes on various insects affecting 

 garden crops ; heat as a remedy for Bean and Pea Weevils; the Chinch 

 Bug in Ohio ; on two Potato Insects (Epiccerus imbricatus and Dorypliora 

 10-lineata); on injuries of the Striped Grape-vine Beetle, and a list of 

 the articles published by the entomologist during the year. The report 

 is carefully prepared and well printed, the most valuable contribution 

 to the knowledge being the account of the experiments with arsenicals 

 against the Curculio, showing, as they do, the utility of the arsenicals 

 for this purpose, and confirming the conclusions which we expressed in 

 our last annual report. Many of the articles have been published else- 

 where in advance. 



Rosin Wash for Red Scale.— In accordance with instructions from the 

 vision, Mr. Coquillett has been making experiments with this wash 

 against the red scale (Aspicliotus aurantii), and after twenty different 

 tests made with various preparations, from the 17th of July to the 8th 

 of August, the one which gave the best results was found to be com- 

 posed of rosin, 20 pounds, caustic soda (70 per cent, strength), 6 pounds, 

 fish oil, 3 pounds, and water to make 100 gallons. In preparing this 

 wash the necessary materials were placed in a boiler and covered with 

 water and then boiled until dissolved and stirred occasionally during 

 the boiling. After dissolving, the preparation was boiled briskly for 

 about an hour, a small quantity of cold water being added whenever 

 there was danger of boiling over. The boiler was then filled up with 

 cold water, which mixed perfectly when added slowly and frequently 

 stirred. It was then transferred to a strong tank and diluted with 

 water to 100 gallons. Neither the leaves nor the fruit were injured, while 

 a large proportion of the scales were destroyed. Those which escaped 

 were either on the fruit or the underside of the leaves. The cost of 

 the wash is 80 cents for 100 gallons or four-fifths of a cent per gallon. 

 An orange tree 16 feet tall by 14 feet in diameter was given 11 gallons. 

 This, however, seems to us to be an unnecessarily large amount, but 

 upon this basis the cost of spraying per tree is 11.2 cents. 



Meeting of Association of Economic Entomologists. — A notice from the 

 secretary is published on page 123. 



