152 EXPERIMENT STATION. [Jan. 



to the cost of different materials and the ease with which they 

 were applied, leaving the question of their relative efficiency 

 for subsequent determination in other seasons. 



Observations on the dates of appearance of the oyster-shell, 

 scurfy and white pine scales have been made as usual, and should 

 be continued for a number of years, to obtain reliable averages 

 for use in spraying. Observations on the number of broods of 

 the codling moth have also been continued, and a more exten- 

 sive series of experiments with this pest is now being planned 

 for next season. 



In 1906 the " blight" caused a large monetary loss in the 

 Connecticut River valley on the onion crop, and as this is 

 caused by a thrips, studies of the best methods of controlling 

 this pest were undertaken in co-operation with several large 

 onion growers. The main difficulty in this work seems to be 

 to devise a machine which will spray a number of rows at once 

 in a sufficiently thorough manner to destroy most of the insects. 

 This problem is now being worked upon, and with good pros- 

 pects of success. 



The number of new mixtures produced for use against the 

 San Jos6 scale has necessitated many tests of these materials, 

 some of which seem quite effective, though expensive, while 

 others apparently are of no value. Thus for nothing tested 

 at this station which is reasonable in cost has excelled the lime 

 and sulfur wash, though a few trials of one substance are quite 

 promising, and these will be continued during the spring of 

 1908. 



Investigations on the work of cranberry insects and the best 

 methods for controlling them have been continued in charge 

 of a special investigator located at Wareham, and it is hoped 

 to publish the results of this work soon as a bulletin. At 

 the request of the Cranberry Growers' Association, sets of 

 cranberry insects and samples of their work are being prepared, 

 to be placed in different parts of the cranberry-growing region, 

 where they will be most easily accessible for examination by 

 growers. 



During the summer the life history of the oriental moth was 

 carefully studied, and all stages of its existence were described 

 and photographed. In addition, a study was made of the local 



