870 EXPERIMENT STATION RECORD. 



Insects detrimental and destructive to forest products used for constructing material, A. D. 

 Hopkins (pp. 60-62). — Brief notes on Eupsalis minuta, Lymexylon sericeum, Prionus 

 laticollis, and other injurious insects. 



Observations on forest and sliade tree insects in New York State, E. P. Felt (pp. 63-68). — 

 Short notes on Anisota senatoria, Caccecia argyrospila, Chalcophora virginiensis, C. liherta, 

 Dentroctonus terebrans, Tomicus caUigraphus, T. balsameus, Monohammus confusor, ehn- 

 leaf beetle, forest tent caterpillar, carpenter moth, and other species. 



Revieiv of tlie white-fly investigations, vith incidental problems, H. A. Gossard (68-74). — 

 Aleurodes citri is reported as infesting 75 per cent of the orange groves in Manatee 

 County. Two fungus diseases were observed on the insect. The white fly is not 

 always fatal to orchards, as is shown by the fact that one grove has been infested for 

 at least 10 years and is still in a vigorous condition. Notes are given on the life his- 

 tory of the insect and on treatment with resin wash, kerosene, and hydrocyanic-acid 

 gas. It was found that when 1 oz. of sulphuric acid and 1 oz. of water mixed together 

 and cold were added to 1 oz. of potassium cyanid, 428.4 cu. in. of gas were produced, 

 while the same quantity of water and acid mixed and added immediately to the 

 cyanid of potash yielded 467.9 cu. in. of gas. Fumigation was done at all hours of 

 the day and in sunshine and cloudy weather. Little injury was done to trees or 

 foliage if fumigated at night or during cloudy weather, but when trees were fumigated 

 in sunshine during the middle of the day some injury resulted. Observations were 

 made on the affect of fumigation on ladybirds and it was found that the majority 

 were destroyed. 



Hydrocyanic-acid gas notes, C. P. Lounsbury and C. W. Mally (pp. 75-80). — This 

 insecticide has been successfully used in destroying lice and other insect pests in 

 railroad coaches, jails, and private houses. Experiments showed that when 1 oz. of 

 potassium cyanid was used to 450 cu. ft. of space it was uniformly fatal to scale insects. 

 Cockroaches were destroyed by 12 hours' exposure to the gas, when 1 lb. of potassium 

 cyanid was used to every 100 cu. ft. of space. Bedbugs and various species of ticks 

 were found to be most resistant to the action of this gas. In treating infested grain, 

 1 oz. of potassium cyanid to 12 cu. ft. of space was found inefficient in the destruc- 

 tion of Calandra oryza and C. granaria. 



TJie use of hydrocyanic-acid gas for exterminating household insects, W. R. Beattie 

 (pp. 80-84). — From experiments with gas in combating cockroaches [Periplaneta amer- 

 icana), it is concluded that 0.1 gm. of 98 per cent cyanid of potassium \>er cubic foot 

 is sufficient to kill all roaches within a period of 3 hours. 



Insects of the year in Ohio, F. M. Webster and W. Newell (pp. 84-90). — Notes on 

 chinch bug, Hessian fly, strawberry weevil, cankerworm, western corn-root worm, 

 pea louse, cabbage bug, San Jose scale, southern turkey gnat, and various other insects, 

 together with a brief report on the use of arsenate of lead, green arsenoid, Paris green, 

 whale oil soap, and tobacco dust. 



Summarizing the results of experiments with Sporotrichum globuliferum since 1894, 

 it is stated that this fungus gives no evidence of its value in protecting the country 

 from an annual recurrence of an attack of chinch bugs. Observations on the spread 

 of San Jose scale from infested fruit indicate that infestation from such sources takes 

 place slowly. 



Frxiits seriously injured by moths, C. W. Mally (90-93). — A report is made on the 

 injury to apples, pears, plums, grapes, peaches, figs, citrus, and other fruits by a 

 moth [Ophiuza lienardi). The moth was observed making punctures in fruits by 

 means of its proboscis, through which the juices were sucked. 



Notes on four imported pests, A. H. Kirkland (pp. 93-97). — Observations on the 

 distribution and injurious attacks of the gypsy moth, brown-tail moth, imported 

 elm-leaf beetle, and imported willow weevil {Cryptorhynchus lapathi). During the 

 year a new colony of gypsy moth was discovered at Providence, R. I. The colony 

 extended over an area of about 2 square miles. During 1900 it is stated that prac- 



