22 



EXPERIMENT STATION. 



[Jan. 



whole bog, than tliere is on a long, narrow one of e(jiial acreage, may 

 also be, to some extent, a factor in favor of tliis insect. If it 

 gained a foothold on one portion of such a comjiact bog, it would more 

 readily and quickly spread to all other portions. 



It seems jjrobable, from the various observations made, that if a large 

 bog, round or scjuarish in shape, is by any means whatever entirely 

 freed from this insect (even by burning or by long-continued summer 

 flowage), it will not, as a rule, long remain so if all the following 

 conditions are allowed to exist : — 



1. Winter flowage, especially if it is deep, over a considerable i)or- 

 tion of the bog. 



2. Not more than one reflowage after the 25th of May. 



3. Conditions favoring heavy vine growth. 



New Pests. — During the season two new insect pests did consideia- 

 ble injury in some localities on cranberry bogs. One of these is a scale 

 insect {Asj^idiotus oxycoccus Wogium) which sujicrficially resembles 

 the San Jose scale somewhat but is very distinct from that species. 

 This species did much injury on a bog in Yarmouth and was noted 

 in smaller numbers in a few other places. 



The other insect is a species of white grub {Lachnosterna s]).). It 

 caused the dying of circular areas on several bogs, jirincipally in 

 Carver, these patches varying in diameter from 3 to 30 feet. This 

 injury observed superficially might easily be mistaken for the " ring- 

 worm " injury caused apparently by fungous disease. 



2. Fungous Diseases. 

 This work, as during the i)revious season, was done in co-operation 

 with the Bureau of Plant Industry. Co-operative spraying experi- 

 ments were carried on by several practical growers. In addition 3 ])lots 

 on the station bog, each 4 rods square, were sprayed with fungicides 

 and the results noted, as shown by the quantity and keeping quality 

 of the fruit obtained. The amount of fruit gathered from these plots 

 in every case was somewhat less than that from checks marked on the 

 surrounding bog. This was due, apparently, to the injury done by 

 trami)ing on the vines while spraying. Loss due to decay up to Decem- 

 l)er 4 was reduced, on an average, about one-half by the treatment. 

 One i)lot was sprayed three times and the others twice with mixtures 

 and on dates as follows: — 



