504 



Pests and Diseases. — Rept. Grenada Agric. Dept., 1920, Barbados, 

 1921, pp. 9-10. 



During 1920 the following pests and diseases were reported from 

 Grenada. Attacks by Hcliothrips rubrocinctus, Giard, on cacao were 

 mild, only a few severe local cases being recorded. The good effects 

 of drainage and proper cultivation combined with spraying are being 

 recognised. 



Investigations were commenced concerning the damage caused by 

 Calotermes balloui to cacao trees. These trees were also considerably 

 damaged by Cremastogasier brevispinosa var. minutior (acrobat ant). 

 Control experiments were carried out with flowers of sulphur, calcium 

 arsenate, and borax, in both dust and spray fomi. Flowers of sulphur 

 killed the greatest number, but did not produce effective control. 

 Negligible results were obtained with poisoned syrups and grease 

 bands. 



Sugar-cane was severely damaged in two districts by Tomaspis 

 saccharina, Dist. Although in one district the adult froghoppers 

 were heavily infested with fungi, the canes were severely damaged ; 

 in the other district the infested held had been ratooned for about 

 sixteen years. Damage was also caused by Diatraea saccharaUs, F, 

 (cane moth borer) and advice as to control measures was given. 



Chionaspis citri, Comst. (orange snow scale) was widespread on 

 limes. 



During the dry months of the year coconuts growing in exposed 

 places were attacked by Aspidiotus destructor. Sign. (Bourbon scale). 

 Rhvnchophorus paimarum, L. (palm weevil) was observed in all stages 

 of coconuts dead or dying from red ring disease, and in young plants, 

 where the hearts were often severely damaged. In all districts 

 coconuts were infested with Aphelenchiis cocophilus, Cobb, the 

 Nematode causing red ring disease, and dead palms were destroyed as 

 a preventive measure. Compulsory measures can now be taken 

 under the Agricultural Interests Ordinance, but have not yet been 

 resorted to. 



Pineapple fruits on a badly cultivated holding were considerably 

 damaged by a weevil thought to be a new species. In some cases the 

 crowns were either deformed or absent. A gummy exudation oozed 

 from punctures in the fruits, and the fruit stalks were badly riddled. 

 Yams were attacked by Aspidiotus hartii, Ckll. The foliage wilted, 

 and there was a heavy infestation of the insects on the tubers. 



UvAROv (B. p.). A new Genus and Species of Orthoptera found in a 

 Greenhouse in England. — Ent. Mthlv. Mag., London, Third Ser., 

 no. 81, September 1921, pp. 206-209. 



Chopardina importata, gen. et sp. n., is recorded from a greenhouse. 

 Another grasshopper, Tachycines asynamoriis, Adel., often found 

 in greenhouses, has been frequently erroneously recorded as 

 Diestrammena marmorata, De Haan [cf. R.A.E., A, v, 98]. 



Green (E. E.). Observations on British Coecidae with Descriptions 

 of New Species. — Ent. Mthlv. ^lag., London, Third Ser., nos. 80 

 and 81, August and September 1921, pp. 189-200, 7 hgs. 



The species dealt with include : Psendococcus comstocki, Kuw., on 

 bananas imported from the \\'est Indies ; P. paludinus, sp,, n., on 



