213 



application about 10 days after the second will be necessary. In 

 two years the insect should be almost completely destroyed in any 

 orchard, provided that infested orchards are not situated close by, 

 in which case efforts should be made to treat these also. In all orchards 

 every tree, whether fruit-bearing or not, should be sprayed. 



The best spray mixture consists of 2 to 3 lb. lead arsenate paste, 

 or 1 to 1^ lb. lead arsenate powder to 40 gals, w^ater, its effectiveness 

 not being increased by the addition of molasses, which adds to the 

 cost, causes the spray to wash off more quickly and sometimes scorches 

 the foliage. Heavy rather than light applications of the mixture 

 should be made, especially if only two are given, because they remain 

 on longer, and since adults continue to emerge for a period of 6 weeks 

 or more, the poison must remain on the trees to kill them before they 

 can oviposit. 



Progress in the Chief Industries. Cotton. — Rept. Agric. Dept. St. 

 Vincent, 1917-1918; Barbados, 1919, pp. 15-19. [Received 18th 

 March 1919.] 



The measures adopted by the Agricultural Department for the 

 control of the cotton stainer, Dysdercus delauneyi, together with a 

 prospect of high prices for cotton, led planters to make a further 

 extended trial and to plant an increased acreage in 1917-18. In 

 St. Vincent success attended their efforts at control and the yield 

 per acre exceeded the average of the previous 13 years. Under local 

 conditions the practice of pulling up and burning the old cotton 

 stalks at the end of each season has had the effect of relegating the 

 leaf-blister mite, Eriophyes gossypii, to the position of a very minor 

 pest, and recent experiments show that the stalks, if dealt with 

 promptly, can be used as traps for cotton stainers. 



An important Order- in-Council was published on 25th July under 

 the Importation of Plant Diseases Prevention Ordinance (1906) 

 prohibiting the importation of cotton seed and seed cotton into the 

 Colony from any outside source. Though primarily intended to 

 prevent the introduction of the Mexican boll weevil [Anthonomus 

 grandis] and pink bollworm [Pectinophora gossypiella], it also aimed 

 at the exclusion of certain pests and diseases occurring in other parts 

 of the West Indies, but not found locally. 



Newell (W.). Report of the Plant Commissioner for the Biennium 

 ending April 30th, 1918, and Supplemental Reports.— Q/rZy. Bull 

 Florida State Plant Board, Gainesville, iii, no. 2, January 1919, 

 pp. 33-108, 



During the two years ended April 1918, the Florida State Plant 

 Board, in accordance with the Florida Plant Act of 1915, has been 

 ?ible to maintain a successful barrier against the entrance of the 

 black fly of citrus [Aleurocanthus woglumi], a most serious pest occurring 

 in Cuba, Jamaica, the Bahamas and the Canal Zone. Nursery inspec- 

 tion resulted in the San Jose scale [Aspidiotus perniciosus] being 

 found on 110 occasions. Camphor thrips [Cryptothrips floridensis] was 

 found in 10 nurseries and suitably dealt with, and the banana root- 

 borer [Cosmopolites sordidus] being found in one, all banana plants, 

 in this and adjacent properties were promptly destroyed. 



