322 STATE BOARD OF AGRICULTURE. 



the control of Woolly Louse in youug apple trees in the nursery. This 

 question is one of prime importance, but we do not hope for immediate 

 results, since the question is an old one, and one that has occupied the 

 attention, bolh of entomologists and nurserymen for many years. We 

 do not despair, however, of finally discovering some method that will 

 make it possible for the nursery to send out really clean stock without 

 discarding an unreasonable percentage of their young trees. This latter 

 experiment is in cooperation with one of the largest nurseries in the 

 state. 



During the year Mr. G. C. Woodin resigned, in order to pursue gradu- 

 ate work elsewhere. Mr. Woodin left on the 1st of September, 1916. His 

 place has been filled by Mr. P. B. Wiltberger, who took up his duties on 

 the 1st of April, 1917. Mr. Wiltberger, is, at present, doing considerable 

 field work in the control of the insect enemies of fruits and field crops, 

 and is employed by the Station for half of his time. I regret to have to 

 report that Doctor G. D. Shafer, Assistant Professor in the College and 

 Associate Entomologist of the Station, leaves us on the 1st of September 

 next. Doctor Shafer intends to take up private work in the west, at 

 least for a time. No one has as yet been appointed to fill his position, 

 which deals almost exclusively with investigations of basic problems. 



During the year many insects have been reared, and records made of 

 importance to the agriculturist, and one bulletin has been prepared by 

 Doctor Shafer, the title of which is "A Study of the Factors which Gov- 

 ern Mating in the Honey Bee." This bulletin is, at present, awaiting the 

 action of the Experiment Station Council. Another bulletin, dealing 

 with the classification of the Orthoptera of Michigan, is well under way, 

 and we expect to present this very shortly. A number of press bulletins 

 have been prepared, dealing with various insect enemies as they have 

 appeared. 



Respectfully submitted, 



R. H. PETTIT, 

 Entomologist of Experiment Station. 



East Lansing, Mich., June 30, 1917. 



REPORT OF THE DIVISION OF HORTICULTURE. 



To the Director : 



Sir — I herewith make a report of the Division of Horticulture for the 

 year ending June 30th, 1917. 



During the past year special attention was paid to the following ex- 

 periments which are here briefly referred to : 



The dusting and spraying experiments in apple orchards were con- 

 ducted on a commercial scale at Morrice and Grand Ledge. The idea 

 was to make a comparative test of the value of these different ways of 

 protecting apples from the ordinary diseases and insects and also the 

 economics of the different methods. The sprayed portions of the orchard 

 contained a much greater percentage of good fruit than those parts that 

 had been dusted. While it is true that the dust can be applied much more 

 rapidly than the liquid, the cost of the material for the dusting was 



