:7S STATE BOARD OF AGRICULTURE. 



REPORT OF THE HORTICULTURAL SECTION 



To the Director, 



Sir: 



I herewith make a repoi't of the Horticultural section tor the year 

 ending June 30, 1919. The investigational work of the section has 

 been concerned chiefly with such lines of work as have been previous!}'' 

 reported. Progress has been made along these lines in (he following 

 jirojocts: 



DUSTING AND SPRAYING EXPERIMENTS*. 



The work in this line was continued in the orchards at Morrice, Belding 

 Muir, and Grand Ledge, using the various dusts and comparing them 

 with the arsenate of lead and lime sulphur spray to ascertain the com- 

 parative values of these materials in controlling insects and diseases of 

 apples. 



MATERIALS AND APl'LICATIONS. 



Morrice: 



'The Dusting Mixtures used were home mixed, using 90% Niagara 

 Dusting Sulphur and 10% Corona Dry Arsenate of Lead. 



The Spraying Mixtures consisted of Dow Lime Sulphur Ij^i in 50, 

 Toledo-Rex Calcium Arsenate (powder) 1 in 50, and the Dow Lead 

 Arsenate (paste) 2% in 50. All the sprays were applied with the 

 Friend and Hardie Spray Gun. 



Applications. Four regular applications of all mixtures were 

 made, both dusting and spraying. 



Belding: 



Dusting: Four applications were made according to the regular 

 spraying schedule. First and second, 85-15' sulphur and arsenate of 

 .lead; third and fourth, Niagara 3 in 1 sulphur, tobacco and arsenate 

 of lead. All materials mixed by the Niagara Sprayer Co. 



Spraying: Dow lime sulphur, P4 in 50, and Dow lead arsenate 

 (paste), 23/^ in 50. 



Muir: 



Dusting: All dusting done by Mr. Wolverton, foreman at the 

 orchard. Four applications. First and second. Sulphur 50%,, 

 tobacco 35%, calcium arsenate 15%. Third and fourth, 85-15, 

 sulphur and arsenate of lead. All materials mixed by the Niagara 

 Sprayer Company. 

 . Spraying: Lime sulphur, 1 in 50, Toledo-Rex Calcium Arsenate 

 (powder), 1 in 50, and Corona Dry Lead Arsenate 13^ in 50. All 

 spraying done with Friend Spraj^ Gun under high pressure, 225 to 

 250 lbs. Four applications according to regular schedule. 



Grand Ledge: 



Four applications of all materials. Friend Spray Gun used for al 

 spraying. Materials used at the following rates: 

 Lead arsenate (Corona Dry) : 1 in 50 



* Note — For report of previous work see Special Bulletin No. 87, Dusting and Spraying Experiments with Apples. 



