276 STATE BOARD OF AGRICULTURE. 



* 

 Medical Association. Other reports dealing with a great number of 

 organisms are being prepared by Dr. Chandler and will shortly be pub- 

 lished. 



During the winter plan.s were made and work started on an extensive 

 experiment whose final object is to determine the time of flight of the 

 first generation of codling-moth and consequently the time of entrance 

 in the apple of the larvae of the second generation, so that it may be 

 possible to set the date more exactly for the August spraying, in other 

 words to catch the greatest number possible of the young "worms" of 

 the August generation just as they are about to enter the fruit. This in- 

 volves the establishment of twelve stations for rearing the adults in 

 cages and the computation of the optimum dates for spraying in as 

 many other localities as possible. To make these computations we are 

 utilizing the work of Dr. A. D. Hopkins of the U. S. Bureau of Ento- 

 mology, who has devised a method of computing the progress of natural 

 events based on observations made over the entire United States over a 

 long period of years. This project iDromises great returns if it is pos- 

 sible to correct our computations for the influence of Lake Michigan, and 

 certain soil conditions. 



Studies in the control of household pests have yielded some results, 

 most notably in the control of the large American roach, a report on 

 which was published in the Journal of Economic Entomology. 



Another note also published in the Journal of Economic Entomology 

 deals with the apparent discovery that the serious attacks of the buffalo 

 tree-hopper in Michigan which sometimes occurs in young apple trees, 

 almost invariably follows the setting of new orchards in alfalfa or some 

 plant that remains succulent late in the season, or at least the close 

 proximity of some such succulent plant, usually alfalfa or in a lesser 

 degree of red raspberries. These plants furnish ideal feeding places 

 for the tree-hopper late in the season and the young trees furnish a 

 natural place for oviposition. Consequently young trees under such 

 conditions are often deformed or killed outright. When the trees are 

 larger, they are able to withstand these attacks and escape with a few 

 scars. 



The work in animal parasites is progressing satisfactorily. The ex- 

 periment with ox-warble is being repeated with variations this year, 

 using six calves. Last seasons attempt seemed to show that the adult 

 flies of the ox-warble, in captivity, refuse to lay their eggs on calves. 

 It is, naturally, too soon to get the results of the trial now and will be 

 until next Spring. 



The experiments with gape-worms are being continued in the hope 

 that they may run through the winter in the animal house now under 

 construction. This house will be built of brick with suitable 

 quarters for a limited number of animals and will contain a small labor- 

 atory at one end designed for the rough work in post-mortems and for 

 fecal examinations. It should facilitate the work very materially. 



Dr Chandler reports that the experiment in soil treatment for stom- 

 ach worms of sheep, is nearly complete for this season. It remains 

 merely to post-mortem the animals and check up on the findings. 



The Hessian-fly situation is growing worse, as was expected. There 

 seems to be a denrlli of the uaturnl ouomios of this serious ])est niul no 

 amount of urging would prevail on the wheat-growers to actually sow 



