of l-butyl-4, 4-dimethyl-2-(l-ethyl- 

 hexyl) -imidazolidine. 



J. G. CoNKLiN, R. L. Buckle, 



AND W. J. Morse 



Insect Records Show What Harm- 

 ful Insects Are Particularly Numer- 

 ous during the Year. In the summer 

 of 1948, grasshoppers occurred in 

 destructive numbers in localized 

 areas in New Hampshire. Two 

 principal species were concerned: the 

 lesser migratory grasshopper, and 

 the red-legged grasshopper. 



The eye-spotted budmolh and the 

 red-banded leafroller caused moder- 

 ate to severe damage in commercial 

 apple orchards in the southern part 

 of the state. There are indications 

 that the use of modern, mechanized 

 spray devices may be a contributing 

 factor to the increase in these two 

 orchard pests. 



The Japanese beetle has reached 

 the point where very heavy feeding 

 is noticeable, particularly in the 

 cities of Keene. Concord, and Dover. 



J. G. CoNKLIN 



Studies of Forest Insects. Ex- 

 amination of the permanent spruce 

 budmoth observation plots revealed 

 that up to this time this insect is 

 showing no tendency to build up in 

 New Hampshire. 



The outbreak of the bronze borer 

 apparently has come to a standstill; 

 in fact, it appears to be decreasing 

 somewhat in intensity. 



A survey, conducted in areas which 

 had been burned over during the 

 summer of 1947 and which had been 

 re-planted with white and red pine, 

 showed extensive damage by the 

 pales weevil. In some cases as many 

 as 80 per cent of the planted seed- 



lings had been completely destroyed 

 by the fall of 1948. 



Work on this project during the 

 ensuing year will include an investi- 

 gation of chemical control of the 

 white pine weevil. 



J. G. CoNKLIN 



Pales Weevil Damage to Conifers. 

 Ten plots of 100 transplants each 

 were established in the Rochester 

 Fire Area in the spring of 1948. 

 Nursery stock consisting of white 

 and red pine was provided by the 

 State Forestry and Recreation Com- 

 mission. 



The plots have been examined 

 periodically since planting, and sev- 

 eral field inspections have been con- 

 ducted for the benefit of interested 

 persons. 



There is considerable variation 

 among the plots in the number of 

 trees killed. The damage observed 

 one year from the date of planting 

 was 75 per cent of the trees in one 

 plot killed and all but two of those 

 which survived showing injury. 



On the other hand, only four trees 

 have been killed in another part of 

 the burned area under conditions 

 which appear to be somewhat simi- 

 lar. 



In general, however, the damage 

 is around 40 per cent to 50 per cent 

 of the trees killed. The presence of 

 near-by pine trees, each one a foot 

 or more in diameter, usually indi- 

 cates an area of active feeding. 

 Feeding has been observed this 

 spring, though lighter than last year. 



New plantings have been made in 

 the same areas and observations will 

 be continued for at least another 

 year. 



L. C. Swain 



Forestry 



The Sugar Content of Maple Sap 

 Varies Considerably from Tree to 

 Tree. An attempt was made to meas- 



ure the total sap production of each 

 tree; but this attempt was only 

 partially successful because of un- 



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