i27 



Experimental control measures against insect pests of melon and 

 related crops have shown that the striped cucmnber beetle [Diabrotica 

 vittata] can be successfully controlled by dust and sprays. Nicotine 

 killed the young nymphs of the squash stink bug \_Anasa tristis], but 

 merely stupefied the adults. The only effective remedy for the squash 

 vine borer, Melittia salyriniformis, is the collection of the larvae by 

 hand. A new unidentified bug has been observed late in autumn on 

 squash foliage. 



Investigations on the annual cycle of Hessian fly [Mayetiola destructor] 

 have shown that wheat sown on and after the calculated fly-free date 

 is not attacked. Consequently, in practice, the best method is to 

 plough in the stubble and keep the land in cultivation so as to prevent 

 the gro^\i;h of self-so-v\Ti wheat, until the crop can be sown after the 

 fly-free date. 



Sedlaczek ( — ). Relation between Climate and Life-Cycle of the 

 Tussock Moth {Lymantria {Liparis) monacha).—Mthly.Bull.Agric. 

 Intel!, and PI. Dis., Rome, viii, no. 8, August 1917, p. 1200. 

 (Abstract from Oesterreichische Forst- und Jagdzeitxng, Vienna, 

 Year xxxiv, no. 44, 1916, pp. 259-260). [Received 17th January 

 1918.] 



From observations on Lymantria monacha during the period 

 1906-1915, the author has drawn the conclusion that this moth 

 requires for its post- embryonic development a sum-temperature of 

 2,732° F., the moths only appearing in any great numbers in any place 

 when this aggregate daily temperature has been reached. The eariier, 

 therefore, the necessary sum-temperature is obtained, the greater the 

 time the moth has at its disposal for fl}Tng. The nuptial flights take 

 place on fine, windless evenings when the temperature is above 58° F. 

 After years with 12 evenings favourable to flight, the moth has multi- 

 plied to a much greater extent in those with a smaller number ; this 

 explains why it does not breed to any very great extent in the 

 mountains. 



FuLLAWAY (D. T.). Division of Entomology. — Hawaiian Forester & 

 Agriculturist, Honolulu, xiv, no. 11, November 1917, pp. 323-324. 

 [Received 19th January 1918.] 



During the month of October the insectary handled 27,400 pupae of 

 the melon fly \I)acus cucurbitae], from which 1,207 individuals of 

 Opiusfletcheri were bred and distributed. The following parasites were 

 also distributed : — Diachasma fullaivayi, 90 ; D. tryoni 340 ; Tetra- 

 stichus, 200 ; Paranagrus (corn leaf-hopper parasite), 2,650. 



Ehrhorn (E. M.). Division of Plant Inspection. — Hawaiian Forester 

 d Agriculturist, Honolulu, xiv, no. 11, November 1917, pp. 324- 

 326. [Received 19th January 1918.] 



During October a box of pears from California heavily infested with 

 the codling moth [Cydia pomonella] was destroyed. Coconuts from 

 Fanning Island were fumigated before delivery, being infested with the 

 scale, Aspidiotus destructor. Several packages of beneficial insects 

 were imported from Manila. 



