10 



are troublesome, the sulphur in the same proportions can be used 

 with kerosene emulsion, so that both the mites and the scale- 

 insects are attacked by each application. 



REMEDY FOR CATERPILLARS ON COTTON, 



CASSAVA, &c. 



Paris Green has been recommended in the Bulletin* as a dry 

 application for the Cotton Worm, and it is believed that under all 

 ordinary conditions the method recommended is the simplest, 

 cheapest and most effective. 



But wrhere six or seven hundred acres of cotton are planted out 

 in fields of from lOO to 300 acres as a new cultivation with large 

 numbers of wild cotton plants growing all through the neighbour- 

 hood the opportunity for the cotton worm to increase and multiply 

 is at once made use of, and when rain falls every afternoon, 

 washing off the Paris Green, the resultant plague of cotton worms 

 causes very extensive destruction, and a new remedy has to be 

 found to deal with any such emergency. 



It is believed that such remedy is arsenate of lead applied by 

 means of a knapsack spray pump. It does not wash off easily, and 

 does not injure young foliage as excess of Paris Green does. 



It is useful for the destniction of any caterpillar or worm that 

 injures by eating, e.g. the cassava caterpillar, and should be kept 

 ready in stock for any emergency that may arise. 



Prof. Fernald of Massachusetts Agricultural College recom- 

 mends! the following recipe : — 



Arsenate of Lead. 

 4 oz. arsenate of soda (50 % strength). 

 II oz. acetate of lead. 

 150 gallons water. 



" Put the arsenate of soda in 2 quarts of water in a wooden pail, 

 and the acetate of lead in four quarts of water in another wooden 

 pail. When both are dissolved, mix with the rest of the water. 

 Warm water in the pails will hasten the process." 



The proportion of water may vary, the U.S. Dept. of Agriculture 

 (Bull. 41, Div. Entom.) recommends less than half the water. 



If fungus also attacks the leaf, as it did cotton in Vere lately, 

 mix with Bordeaux mixturej: as follows : — • 



"Prepare the arsenate of lead as above, but instead of adding 

 the arsenate of soda and acetate of lead, when dissolved, to the 

 water, mix the two together well, then add one-third of this to 50 

 gallons of Bordeaux mixture". 



Arsenate of lead is put on the market in a very convenient form 

 under the name of Bowker's Disparene & Swift's Arsenate of Lead. 

 The latter can be purchased in Kingston. 



•Bulletin of the Department of Agriculture, Jamaica, II. July 1904, page 159; 

 III. Sept. 1905, page 203. 



t Bulletin No. 96. Hatch Experiment Station of the Massachusetts Agricultural 

 College, May 1904. 



J Bulletin of the Department of Agriculture, Jamaica, III. March 1905, page 61. 



