No. 4.] REPORT OF STATE FORESTER. 391 



the Calosoma larvte have frequently been found under a single burlap 

 band on an average-sized tree. As they feed upon the pupae as well as 

 upon the caterpillars, the amount of benefit derived is very great, although 

 it is difficult to figure the percentage of larvae killed. 



From collections made during the winter of 1912-13 it was determined 

 that Mo7iodontomerus acreus has spread over practically the entire terri- 

 tory now known to be infested by the brown-tail moth. It was not found 

 in as large numbers as during the previous year. Pteromalus egregius 

 has been found widely scattered over the area infested by the brown-tail 

 moth, and its numbers are slowly increasing, judging from the records 

 that have been secured from sample collections. 



There is thus no doubt that a number of the imported species are thor- 

 oughly established, and that they are increasing each year, and, further, 

 that many hundreds of thousands of caterpillars were killed by them 

 during the past summer. 



The Wilt Disease or ''Flacherie." 

 The experimental work with this disease has been carried on 

 almost w^holly during the past season under the direction of 

 Dr. W. M. Wheeler of the Bussey Institution of Harvard 

 University and Dr. L. 0. How-ard, division of entomology, 

 United States Department of Agriculture. The results of this 

 work will be reported on later. The disease itself is found 

 spread generally throughout the moth-infested territory, and 

 is proving a great factor in the control of the gypsy moth. It 

 is to be hoped that through the studies by experts discoveries 

 may be made w^hereby this disease can be even further made 

 use of in the work of suppression. 



The Fungous Disease of the Brown-tail Moth. 

 The work of propagating and disseminating this disease was 

 undertaken and carried out under the usual co-operation with 

 Harvard University. The work of the previous season having 

 been so successful it was thought we could not help getting 

 results from our ripened experience. We had plenty of cater- 

 pillars to work with, but, unfortunately, try as we might, the 

 spores could not be secured to produce the results wanted. 

 The cool season, we believe, had most to do wuth it. Later 

 on in the year, however, a number of places were found where 

 the wilt disease occurred in nature and was extremely effective. 

 We are not discouraged, however, and hope to regain our 



