February, ]9"^9] AGRicTji/riiRAi, experiments 1928 21 



before bousintj, one before tlie outbreak of coccidiosis, and one after the 

 outl)reak. In line with the experience of broiler producers throughout the 

 state, each succeechiig lot showed an increasing amount of coccidiosis. The 

 variation rangcfi from 5.8 percent at 11 weeks with the first to 16.5 percent 

 with the fourth lot. The iodine susjiensoid treatment did not prevent the 

 develo]:iment of acute coccidiosis. The birds grown this year made better 

 growth with a lower mortality than in previous years when no iodine treat- 

 ment was given, but it is (]uestionable whether iodine stispensoid is adequate 

 where the organism has an op])ortunity to multiply over a long period of 

 intensive broiler production. It seems from this that it is inadvisable for 

 poultrymen, other than broiler sj)ecialists, to attempt to produce a large 

 number of broilers prior to the production of stock for egg production. 

 fPurncll Fund. } 



ELIMINATING MOSQUITOES FROM COASTAL MARSHES 



In the spring of 1928 a caj-eful study was undertaken by P. R. Lowry as 

 to the mosquitoes found in southeastern New Hampshire along a portion 

 of the coast. The investigation was planned to include collections of mos- 

 quito larvae and adults at frequent intervals, study of breeding places, 

 determination of the sj^ecics involved and collection of other data that can 

 be made the basis of a report on the mosquitoes of the region in question 

 and eventually the basis for a plan of control. 



This work has been prosecuted carefully and a satisfactory amount of 

 data is accumulating. So far as known this is the first careful survey of 

 the mosquito problem in a coastal region as far north as that included in the 

 study. 



Thirty-seven species of mosquitoes have been found in New Hampshire, 

 of which 20 attack man. Eleven of them are prevalent along the coast, 

 where the salt marsh species is by far the most numerous. Investigations 

 point towards drainage of the coastal marshes as the most feasible means 

 of eliminating the pests. The other two methods, oiling and filling, are not 

 so practical, for the topography of the region lends itself readily to drain- 

 age at a low cost. (Hatch Fund. ) 



EUROPEAN CORN BORER IS NOT MAKING PROGRESS 



The fifth wear's investigations with the European corn borer under New 

 Hampshire conditions bear out the earlier assumptions, reports W. C. 

 O'Kane, who finds no increa.se in the numbers of borers. The density of 

 population of the pest remains too light to yield any data on insect parasites 

 or preferences for dififerent ]'»lants for food. The life history of the insect 

 in this state shows two generations of the insect each year, and this fact 

 defeats its opportunity to increase. The second generation is too immature 

 to pass the winter successfully, and reproduction depends entirely on the 

 larvai that exhibit liut one generation. However, the one-generation phase 

 of the insect is moving eastward, and in all probability will overlap the New 

 England two-generation phase before long. What the result of this will 

 be, no one can predict. An increase in the number of one generation larvce 

 in New Hampshire may bring about destructive abundance. (Adams Fund.) 



