229 



Sanders (G. E.). Spraying and Dusting in Annapolis Valley. — 



Canad. Hortic, Toronto. Out., x\v, no. 2, February 1922, pp. 21-22. 



On account of the extreme dry weather, lack of dew and windy 

 mornings, spraying gave better results, in comparison with dusting, 

 during 1921 than in a normal year. For the same reasons sulphur- 

 lead-arsenate dust gave better results in 1921 than in any previous 

 year in which it had been compared with copper- arsenic dust. The 

 low cost of the latter in 1921 resulted in a saving to Nova Scotia 

 growers of approximately £10,000, as compared with liquid spray. 

 A new formula for dusting made from lump lime of hydrated crystal 

 copper sulphate, instead of dehydrated, and white arsenic in place of 

 calcium arsenate was tested. It keeps perfectly over a longer period 

 as a dust, and is less expensive. 



Experiments were made with a poisoned Bordeaux mixture made 

 according to the white arsenic formula recommended for use on 

 potatoes. A 2-lb. package of white arsenic-hydrated lime mixture 

 (known as D.E.L. mixture) should be stirred into 10 gals, water. 

 A bag containing 10 lb. coarse copper-sulphate crystals should be 

 suspended in the water and stirred until the crystals dissolve. This 

 formula gave excellent results on apple when enough lime was added 

 to give a 3-10-40 mixture. The great advantage of this mixture is 

 the cost, the white arsenic costing one-tenth as much as lead arsenate 

 and one-fifth as much as calcium arsenate. 



The results of testing spray calendars side by side for a number of 

 years are given. In no case did the trees sprayed with lime-sulphur 

 give one-half as many apples as those sprayed with Bordeaux. 



McLennan (A. H.). Three Market Garden Troubles.— Cawa^. Hortic, 

 Toronto, Out., xlv, no. 2, February 1922, p. 23, 1 fig. 



The two chief insect pests of market gardens are the cabbage root 

 maggot [Phorbia brassicae], and the tarnished plant bug [Lygns 

 pratensis]. A solution of 1 oz. corrosive sublimate in 10 gals, water 

 applied the fourth day after planting and twice afterwards, at intervals 

 of a week, has proved the most economical measure. Under some 

 conditions 1 oz. to 6J gals, water has proved effective with one 

 application, but should not be used unless its use is thoroughly under- 

 stood. A bait of 1 oz. sodium arsenate, mixed with 1 gal. water and 

 ^ gal. molasses, and placed in saucers 30 feet apart each way as soon 

 as the plants appear above the ground, is satisfactory for flies related 

 to P. brassicae on cabbages and onions. 



During 1921 a combination that proved effective in controlHng 

 celery bhght, and also L. pratensis on celery, was 20 lb. Bordeaux dust, 

 20 lb. sulphur, 30 lb. lime and 30 lb. tobacco dust. 



Work connected with Insect and Fungus Pests and their Control.— 



Kept. Agric. Dept. St. Lucia, 1920. Barbados, 1921, p. 3. [Received 

 1st March 1922.] 



Bananas were infested with banana weevil borer [Cosmopolites 

 sordidus], which may be controlled by destroying all infested and 

 unhealthy plants and maintaining clean cultivation. Regulations 

 prohibiting the importation of sugar-cane cuttings, rice, maize or 

 grasses from Porto Rico to protect St. Lucia against the introduction 

 of mosaic diseases have already been noticed [R.A.E., A, x, 130]. 



