EXPERIMENT STATION REPORTS. 97 



REPORT OF THE ENTOMOLOGIST. 



Prof. C. D. Smith, Director: 



Following is a brief report of the work done by the Division of Entomology 

 during the year ending June 30, 1905, also of the work in botany since the 

 appointment of the writer acting botanist. 



One bulletin has been issued during the year, viz.: "The Codling Moth 

 in Michigan." The work on mosquitoes was carried on during the latter 

 half of the summer of 1904 with very gratifying results. The fish intro- 

 duced in 1903 multiphed to such an extent that the numbers of the pests 

 were reduced very noticeably, also many new breeding places were mapped 

 and treated with oil, resulting in a marked abatement of the mosquito 

 nuisance, inasmuch as almost all of the pests present on the campus came 

 in from outside. 



The work on the codling moth was completed and the results published 

 in bulletin No. 222. One orchard is now under experimental condition in 

 order to check up and prove the results once more. 



Quite an extended course of experiments have been carried on during 

 the last two years against greenhouse and forcing-house pests, with very 

 good results; green-fly, chrysanthemum aphis, and the lice on lettuce have 

 been controlled very cheaply without the nuisance and odor attendant on 

 smoking. Several of the greenhouse scales have also been killed by means 

 of sprays. The results of these and other experiments will be published 

 at some time in the future in a bulletin on greenhouse and forcing-house 

 pests. 



A bulletin on garden insects is well started, after the plan of Special 24, 

 on fruit insects. It will include results of a number of experiments made 

 in our small experimental garden. 



A number of pests new to the state have appeared during the past year, 

 also some old enemies have made themselves conspicuous. Among these 

 are an engraver beetle, which has attacked grape during the first part of 

 the summer, namely Xyleborus pyri. This insect ordinarily attacks felled 

 hardwood trees but occasionally works on fruits. 



A nematode or thread worm in wheat threatened our fields but seems 

 to have failed to withstand the vigorous spring growth. 



The pale-brown byturus, B. unicolor, a small beetle about three-twentieths 

 of an inch long, has attacked the flowers of our raspberries, and the straw- 

 berry weevil (Anthonomus signatus), has seriously injured the blackberry 

 flowers in one locality. 



Joint-worms (Isosoma) have worked in great numbers in grain all over 

 the state. 



The strawberry root-louse has recently made its appearance. This insect 

 has come to st&f, and one more serious enemy of the strawberry is now 

 present in our state. It is usually indicated by the presence of ants in 

 large numbers. 



A tiny beetle, Clivina impressifroms , attacked the corn seed in the hill 

 this year in one locality. So far as known to the writer, this is the second 

 time that serious injury has been inflicted by this beetle. The first record 

 comes from Indiana where Professor Webster found it at work. 

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