44 



a harmless Dipteron, Stratiamys chameleon, L., and two injurious species, 

 the Neuropteron, Triuenodes bicolor, and the PyraUd, Nymphuhi 

 [Hydrocampa) mjiuphaeata, L. The larva of T. bicolor cuts the leaves 

 of aquatic plants for use as a sheath or cover and also uses the rice 

 leaves for that j^urpose. N. nyinphaeata is more injurious, as it not 

 ordj makes a sheath of the leaves, but also feeds on the rice-plants. As 

 a control measure, the introduction of carp into the rice-fields is 

 advised, as these fish destroy large numbers of the larvae. 



Chavanne (J. J.). Fungoid Diseases of the Sugar-cane at Tucuman 

 (Argentina). Jnternat. Rev. Science d) Practice Agric, Mthltj. 

 Bull Agric. Iidell. & PI. Bis., Rome, vii, no. 7, July 19l'(). 

 pp. 1039-1040. [Abstract from Ministerio de Agricoltura de la 

 Nacion, Direccion General de Ensenanza e Investigaciones Agricohs, 

 Secciou Escuelas Especiales, Buenos- Aires, Year 1916, no. 51, 

 pp. 5-32, 2 p].] [Received 30th November 1916.] 



The author considers that " polvillo " on sugar-cane is identical with 

 " top-rot " occurring in Java, Mauritius, Demerara, etc. Although 

 the pathological evidence as a whole points very strongly to a bacterial 

 cause, the almost constant presence of larvae or other small organisms 

 in the infected tissues suggests that these may ]:)lay an important part 

 in the spread of this disease. The larvae met with most frequently are 

 Dipterous, almost all being those of the Ortalids, Evxcsta chavanne i 

 andE. argentina, Brethes. If these larvae, taken from diseased plants, 

 are introduced into a deep wound produced artificially in the region of 

 the terminal bud, the characteristic symptoms of " polvillo "' will 

 eventually occur. 



De Gregorio (A.). The Efficacy of Aphelimis silvestrii in Control of 

 Chrysomphahis dictyospermi in Sicily — Intcrnat. Rev. Science & 

 Pract. Agric, Mthty. Bull. Agric. InieJl. & PI. Dis., Rome, vii, 

 no. 7, July 1916, p. 1056. [Alastract from Nuovi Annali di Agri- 

 coltura siciliana, Palermo. (6) v, part 1, Januarv-March 1916, pp. 

 18-19.] [Received 30th November 1916.] 



In the neighbourhood of Palermo, Aphelinus silvestrii has increased 

 to such a degree that it has almost completely destroyed Chrysovt- 

 phalus dictyo!<p('rmi. and this scale no longer causes serious injury to 

 citrus trees or fruits. 



Topi (M). The Efficacy of Hot Water Treatment against " Cochylls " 

 and "Eudemis '\-~Inlernat. Rev. Science & Practice Agric, Mthh/. 

 Bull. Agrir. Inlell & PI. Bis., Rome, vii, no. 7, July 1916, 

 pp. 1057-1058. [Abstract horn Rendiconti Sedate R. Accad. Lincei, 

 Classe di Scienze fisiche, matematiche e natarali, Rome, (5) xxv. 

 1st Half- Year, no. 7, 2nd April 1916, pp. 524-528.]. [Received 30tii 

 November 1916.] 



The subject-matter of this paper has already been abstracted from 

 another journal [see this Review, Ser. A, iv, p. 383], where the time of 

 mimersion at 150° F. is correctly given as 10 seconds, and not 10 

 minutes, as erroneouslv stated here. 



