2. These caterpillars show a strong tendency to work at night 

 and hide under the vines or anything else that they can find during 

 the day. On this account^ in case the caterpillars have become so far 

 developed that it is not practicable to spray, lay down boards for them 

 to hide under and destroy those that collect there. 



THE YELLOWHEAD CRANBERRY WORM. 

 Peronea minuta (Robinson). 

 In Massachusetts this insect is troublesome only on dry bogs. It 

 works very much as does the true fire worm on winter flowed bogs. 

 It is very heavily parasitized each year and the parasites need only 

 a little assistance to keep it entirely under control. One thorough 

 spraying with Arsenate of lead at the rate of five pounds in fifty gal- 

 lons of water at the time of the hatching of the eggs of the second 

 brood of worms (there are two broods in Massachusetts, the first 

 seldom doing much injury) is sufficient to clear a badly infested bog 

 for three or four years. The time for this spraying will vary some- 

 what with the season, but will average from the 4th to the 10th of 

 July. 



THE CRANBERRY GIRDLER. 

 Crambus hortiiellus (Hiibner). 

 Recommoulations for treattnent : 



A. On bogs which can be reflowed : 



1. Reflow immediately after picking, for a week or ten days. 



2 . If the early fall flozving has been neglected, reflow for a day or 

 two about the loth of fune. 



B. On dry bogs : 



This insect is rarely, if ever, seriously injurious where the vines 

 have been freshly sanded, while it is worst on those bogs on which a 

 thick accumulation of old leaves has been allowed to collect under 

 the vines. It seems probable therefore, that if a dry bog were kept 

 well sanded, each year's production of old leaves thus being covered 

 up, there would be no trouble from this insect. Frequent sanding is 

 also helpful in throwing ofif frosts on bogs without water supply. 



I . // is therefore recommended as a preventive of both frost and 

 girdler injury, to sand all dry bogs during the first two weeks in May 



