10 BULLETIN 554, U. S. DEPARTMENT OF AGRICULTURE. 
Investigations conducted in this region demonstrated beyond doubt 
that there is only one generation annually. Field records kept on a 
number of badly infested bogs throughout the entire season showed 
only a single flight of moths from about June 10 to mid-July, after 
which there was no further evidence of moths until the following 
year. This was also demonstrated in a mosquito-bar cage covering 
2.4 square rods, from which moths issued from June 10 to July 8, 
and although oviposition occurred in the cage, none of the larve 
pupated during that season. 
Larve are rarely found in wet situations or in places where a lack 
of drainage is materially affecting the productiveness and health of 
the vines. 3 
The drier locations, such as knolls, the high margins of the bogs, 
and well-drained areas having a considerable quantity of fallen 
leaves and trash under the vines are the places injuriously infested. 
The character of the soil is not so important a limiting factor as the 
drainage. Severe injury occurs on mud and peat bottoms as well as 
on savannas, provided a good layer of trash is present and the land 
is well drained. 
Larve are never found feeding in exposed positions, but always 
buried beneath more or less trash. When exposed to the light, as 
when trash is turned over, they usually are found in a curved — 
position and motionless. After a period of about 10 seconds the 
larve will start crawling rapidly for cover, and it is at this time 
that they are most easily detected. The trashy nature of the infested 
situations also renders their location difficult. Many growers have 
failed utterly to locate the larve, although the vines may have shown 
injury of an extreme type. 
The amount of damage done by the cranberry girdler seems out 
of all proportion to the number of larve to be found in a given 
location. In one instance, however, the writer found 30 cocoons 
containing larve and 1 naked larva in an area of about 4 square feet. 
What appears to be the most important point in the seasonal 
history of this pest from the standpoint of its control is the period 
when cocoon making begins. The few publications available on the 
seasonal history of the cranberry girdler present various statements 
regarding the time of cocooning. Some writers have placed the 
period as late as November, and others have indicated this period as 
beginning at varying dates in September and October. Realizing 
the importance of knowing more definitely when cocooning com- 
menced, the writer has made collections of larve and cocoons in the 
fall, and from these data it may be stated for New Jersey condi- 
tions that some larve form cocoons in late September and the ma- 
jority in early October. Records obtained from bogs in different 
localities are shown in Table IV, 
