ENTOMOLOdY. 20V) 



factory results in a 15 j)er cent solution, while kerosene lunl to lie usetl in a '20 per 

 cent solution. The most effective spray, however, was Kose Leaf tobacco extract, 

 which was found quite satisfactory when diluted in a j)roportion of 1 to 40 in water. 

 It proved to be impossible to destroy all the plant lice on a tree by one ap])lication 

 of any insecticide. 



Experiments in cond)ating strawberry root louse showed that 0.2 gm. of cyanid of 

 ])otash per cubic foot was not sutticient to destroy the lice in a period of 20 minutes. 

 It was found that {)lants could be fumigated with this strength of gas for 45 minutes, 

 or less, without injury. Whale-oil soap and Rose Leaf insecticide seriously injured 

 the plants in some experiments, l)ut weaker solutions proved harndess. 



Notes are given on Eiizopheni semijunerdlls. The species is reported as injurious to 

 plums, apples, pears, and other fruit trees. A description is given, together with 

 notes on its life history. It appears that there are two, or perhaps three, broods in 

 Delaware. Notes on the destructive pea louse include an account of spraying and 

 brushing, and the effectiveness and cost of these methods. The species was quite 

 abunilant in Delaware during the year and opportunity was had for experiments 

 with the Brakeley sprayer, and other devices. The author believes that so long as 

 the vines are still u))riglit, any machine which will s]>ray 2 (ir 4 rows at a time will 

 he found satisfactory. 



A numl)er of experiments were made in testing remedies for comliating the cod- 

 ling moth. During these experiments it appeared that the codling moth had 1 brood 

 and onl-y a partial second in central Delaware. Spraying experiments in (■()nd)ating 

 the codling moth included the use of arsenid of lime, Paris green, and Disjiarene. 

 These experiments were supplemented by banding tests. Arsenid of lime did not 

 give very satisfactory results. With Paris green 61 per cent of benefit was observed, 

 while with Disjjarene the benefit amounted to 87 per cent. On account of the dan- 

 gers and practical ditticulties of manufacturing arsenate of lead on the ordinary farm 

 estate, it is reconnnended that the insecticide be bought in a prepared form. The 

 results of experiments in the use of bands indicated that about 15 per cent of the 

 codling moths were captured by this device. A combination of Bordeaux mixture 

 with an arsenite and kerosene was successfully used for a number of ]>urposes. A 

 combined insecticide and fui.gicide was used against codling moth and plant louse 

 with good success. Crude petroleum was tested in mechanical mixtures with water 

 in strengths of 15, 20, and 25 per cent. All San Jose scales were killed by the 25 per 

 cent S(jlution, while some remained alive after spraying with weaker solution. Fumi- 

 gation of low growing plants, such as melons, with hydrocyanic-acid gas proved 

 possible and practicable. The author tested the use of paper covers and iron frame 

 covers in these experiments. The results obtained indicate that the effectiveness of 

 the gas depends upon its thorough diffusion, and that treatment can not be effective 

 if not jtroperiy diffused. 



The resisting power of insects, C Sterne [Prometlieus, 12 {1901), Xo. dlO, pp. 

 602-605, figs. 4)- — Notes on the resisting power of different species of insects to cold, 

 heat, hunger, poisons, and submergence in water. 



The principal insects injurious to tobacco in the Island of Reunion, E. 

 BoRDAGE {Rev. Agr. Rruiiiou, <V {1902), No. 3, pp. 103-112). — In this article the author 

 gives biological and economic notes on a number of insects which attack tobacco in 

 the island of Reunion. The more important species are Gelechia milaiwlhi, ))oliwonn, 

 suck fly, and cigarette beetle. 



The sugar-cane borer, H. M.axwell-Lefroy ( West Indian Bid., 3 {1902), Nu. 1, 

 pp. iS'S-90). — The life history of Sphenophorus serireus is summarized as follows: The 

 eggs are laid singly in the tissue of sugar cane, and the grub, after hatcning, burrows 

 in the cane, destroying almost the whole interior. The remedies which are recom- 

 mended for controlling this insect includi. the destruction of all rotten or infested 

 cane, the covering of all rattoon stumps with mold as soon as the canes are cut in 



