32 



and wingless forms have been found on grapes. The winged forms 

 produce "an average of 6 young a day; the wingless from 6 to 10. 

 Autumn migrants are produced upon grapes durmg early October, 

 and during the following week are found depositing oviparous females 

 upon Viburmm. The males are produced a little later than the 

 autumn migrants, but are frequentlv found on Viburnum before the 

 oviparous females are mature ; during this period they feed upon the 

 Viburnum leaves. Each oviparous female after pairing lays from 

 3 to 6 eggs. 



Maziekes (A. E. de). Culture de la Pomme de Terre sur le Littoral et 

 dans les Regions 61ev6es pendant et apres la Guerre. [Potato 

 Cultivation on the Coast and in the hilly Regions during and 

 after the War.] — Rev. Hortic. de VAlgerie, Algiers, xxi, no. 8-9, 

 August-September 1917, pp. 131-142, 8 figs. [Received 22nd 

 November 1917.] 



PJitkorimaea operculella does considerable damage in potato tubers 

 set apart for seed, causing rapid decomposition among them. As a 

 preventive, the potatoes should be sprayed ^vith an arsenical mixture. 

 As a check to the increase of the moth, all infested tubers should be 

 destroyed by burning. Any sprouts appearing on the tubers should 

 be cut off, as these are selected by the moths for o\aposition. The 

 crop should not be left long on the ground, while all contaminated 

 leaves and field refuse should be carefulh' burnt. A sj^ecies of Tylench us 

 attacks potatoes, but causes less damage to that crop than to tomatoes, 

 beans or onions. 



Experiments with a Parasitic Fungus of the Cacao Thrips. — Rep. Agric. 

 DepL Grenada, 1916-1917; Barbados, 1917, pp. 11-12. 



Experiments with the fungus, Sporolriclium globuliferum, which has 

 been found to infest the cacao thrips {Heliothrips rubrocinctus) [see 

 this Review, Ser. A, iv, p. 250, and v, p. 268] have been continued. 

 Cultures of the fungus were sprayed over infested trees in the cacao 

 plot, and also on cacao plants in boxes. Considerable numbers of 

 adult thrips were killed, while many nymphs and adults were found 

 parasitised by the fimgus. It is considered that the measure of 

 success attending these experiments justifies more extensive trials 

 in the field, for which arrangements are being made. 



Insect Pests and Diseases.— i?ej3^. Agric. Dept., Grenada, 1916-1917 ; 

 Barbados, 1917, pp. 12-13. 



The cacao thrips [Heliothrips rubrocinctus] was unusually numerous 

 on cacao between September and December, 1916, after which the 

 infestation gra'dually diminished, disappearing by the end of March. 

 Leaflets were subsequently distributed among planters, reminding 

 them of the importance of control measures before the next outbreak 

 should occur. It is probable that experiments wiih. Blackleaf 40 will 

 be made on some estates. The froghopper, Tomaspis saccharina, Dist. , 

 although not a serious pest of sugar-cane in Grenada, caused consider- 

 able damage in certain localities. Clean cultivation in the sugar-cane 



