324 



The Colorado potato beetle [Leptinotarsa decemlineata] is recorded 

 for the first time in the Province. Earwigs, probably Forficula 

 auricularia, were reported from Vancouver as household pests, 



Stratford (G.). Control of Red Mite on Apple-Trees.— iVew; Zealand 

 Jl. Agric, Wellington, xx, no. 3, 20th March 1920, pp. 176-178. 



In a series of experiments for the control of red mite [Tetranychvs 

 sp.] tests were made with various brands of red oil and hme-sulphur. 

 All brands of red oil were almost equally effective, and no injury to the 

 plants was noticed. When used at a strength of 1 to 8 and applied 

 as late as possible, they are useful in controlhng the mite in the egg- 

 stage. 



Lime-sulphur sprays should be used at the time of fruit formation 

 at strengths varying from 1 : 80 to 1 : 100. 



Contra el Barrenillo del Olivo. [Measures against Phloeotrihus 

 scarabaeiodes .] — Rev. Inst. Agric. Catalan de San Isidro, Barcelona, 

 Ixix, no. 4. 20th February 1920, pp. 60-61. [Received 10th May 

 1920.] 



In view of the losses caused by the olive beetle, Pldoeotribus 

 scarabaeoides {oleae), and the olive fly, Dacus oleae, the Provincial 

 Council of ilgriculture in Barcelona has circulated the local authorities 

 requiring the burning of all olive prunings or their storage in tightly 

 closed rooms. A reminder is given that the best means of combating 

 D. oleae consist in scraping the trunks and in keeping the store-rooms 

 clean after crushing the ohves, all debris being burned. 



Loos (K.). Die Generationsverhaltnisse unserer Borkenkafer. [The 

 Generations of our Bark-beetles.] — Vereinsschrift f. Forst-, Jagd- 

 u. Naturkunde, Prague, 1918-1919, no. 7-9, pp. 283-288. 

 [Received 17th May 1920.] 



An accurate knowledge of the conditions governing the number 

 of generations of bark-beetles is of the greatest importance to forestry, 

 but requires a very great deal of careful research. Eichhofi believed 

 that there are 2 or even 3 annual generations in the case of the chief 

 species represented in Bohemia, but the author points out that this 

 would result in so numerous a progeny that natural enemies could 

 scarcely exercise a valid check. Eichhofi stated that it is the second 

 generation of Dendroctonus micans, Kug., that hibernates. Without 

 definitely rejecting this the author records the presence of y-oung 

 adults at the end of March and in April, June, July, September, 

 October and November ; they also may remain for a longer period 

 at their place of origin where they enlarge the larval mines. Larvae 

 were found early in July and early in September ; they were half- 

 grown in mid-September and early October. Pupae were met with 

 on 5th July, 9th September, 14th September and 7th November. 

 Pohjgraphus poligraphus, L., is another species said by Eichhoif to 

 be two-brooded, but a table here given shows that hibernation begins 

 in mid -November and that a period of 348 days elapses from then to the 

 development of the egg. In the case of Hylesinus fraxini , F., infested 



