18 



To fumigate citrus trees, immature peach trees, roses, buds and scions 

 in a fumigating box, with sodium cyanide, | oz. per 100 cu, feet is 

 required. In the case of dormant peach trees, or similar hardy 

 deciduous trees such as apple, pear and plum, f oz, sodium cyanide 

 per 100 cu. feet box space is necessary. 



The following tabulated formulae are given : — For Citrus, etc., 

 ^ oz. sodium cyanide (96-98 per cent, pure), f oz. sulphuric acid 

 (93 per cent, pure), 1^ oz. water ; for peach, etc., f oz. sodium cyanide 

 (96-98 per cent, pure), 1^ oz. sulphuric acid (93 per cent. pure),*2J oz. 

 water ; for Citrus, etc., f oz. potassium cyanide (95-96 per cent, 

 pure), f oz. sulphuric acid, 1 f oz. water ; for peach, etc., 1 oz, potas- 

 sium cyanide, 1 oz. sulphuric acid, 3 oz. water. The time required 

 for fumigation in each case is 30 minutes. 



Annual Report 1915. — Qtrly. Bull. Florida State Plant Board, Gaines- 

 ville, i, no. 3, April 1917, pp. 59-123. [Keceived 13th November 

 1918.] 



The maintenance and improvement of the Port and Kailway 

 Inspection service are imperatively necessary if the following insect 

 pests are to be permanently kept out of the State of Florida : — 

 Morelos fruit worm and the pink boll-worm [Pectinophora gossypielh] 

 both occurring in Mexico, avocado weevil [Heilipus h,uri] from 

 Central America, spiny citrus whitefly [Aleurocanthus woglumi] from 

 Jamaica and the Bahamas, pineapple borer [Metamasius ritchei] 

 from Jamaica, gipsy moth [Porthetria dispar] and brown-tail moth 

 [Nygniia phaeorrhoea] from New England, and the Mediterranean 

 fruit-fly [Ceratitis capitata] from many subtropical countries. 



The Australian Coccinellid [Novius cardinalis] has been found fully 

 as efficient in controlling the cottony cushion-scale [Icerya purchasi] 

 in Florida as in California and other States. The control effected by 

 it is in fact practically complete, so much so indeed that the beetles 

 tend to disappear owing to their food supply being exhausted, and 

 therefore need to be re-introduced from time to time. It has been 

 found possible to keep living beetles and also supplies of 7. purchasi 

 in cold storage for a considerable time. 



Experiments are being made to determine the best treatment for 

 camphor trees infested with the camphor-thrips [Cryptothrips flori- 

 densis]. Treatment with a 2 per cent, oil emulsion, applied to the 

 infested trees after they have been severely cut back, promises to be 

 both an efficient and practical method for treating infested nursery 

 stock. 



Back (E. A.). Florida and the Mediterranean Fruit Fly.— Qtrly. Bull. 

 Florida State Plant Board, Gainesville, i. no. 4, July 1917, 

 pp. 159-171, 2 plates, 5 figs. [Received 13th November 1918.] 



The possibility is discussed of the spread of Ceratitis capitata 

 (Mediterranean fruit-fly) into the North American continent, at present 

 the only large land area upon which it has not become established. 

 The history of its spread in other parts of the world is given, together 

 with known instances of artificial dissemination. While conditions in 

 the past have not favoured the establishment of this pest in California 

 and the Gulf Coast States, the opportunities for such a spread have 



