49 



Inundation as a means of killing the larvae failed experimentally ; 

 they survived submersion for 24 hours, and one example revived after 

 48 hours. 



Old traps must be supplemented by fresh ones if the catches decrease, 

 but the old ones must be continued for some time longer. Traps of 

 vegetable refuse measuring about 2 cubic yards gave good results. 

 Market refuse, leaf manure, refuse from the nipa industry, coffee and 

 cacao husks are good baits. The captured grubs must be killed, and 

 this is easily effected in boiling water. 



Three experiments were undertaken in clearing gardens of breeding 

 places and keeping traps at the same time in a place surrounded by 

 infested native plantations. One of these has terminated and gave 

 fairly satisfactory results. The number of larvae, etc., caught, 

 decreased in a single year by 74 per cent, and the injury to the trees 

 by 37J per cent. The results of the other two experiments will be 

 published after they have been carried on for 2|- years. 



As regards preventive measures, dead or dying palms must be cut 

 at soil-level and the stumps covered with 8 inches of sand or other 

 soil without humus. The logs must either be buried or split up. 

 Logs used for bridges must be treated with preservatives and protected 

 at the ends with sheet metal, and replaced after 9 months. All 

 vegetable refuse of a dangerous character must be buried and covered 

 with sand ; burning is advised only if the refuse can be thoroughly 

 incinerated. Animal manure must be covered with sand or kept in 

 pits with a close-fitting cover. 



Other measures include thorough examination of the crown when 

 picking the nuts, the beetles being extracted or killed in sitit and the 

 holes closed up. Where legal ordinances cannot be carried out and 

 planters must take their own measures, the use of controlled trap-heaps 

 is advised in addition to the preventive methods already mentioned. 

 These heaps can most effectively be poisoned as described above. 



Franklin (H. J.). Seventh Report of the Cranberry Substation from 

 1917 to 1919.— Mass. Agric. Expt. Sta., Amherst, Bull. 192, 

 October 1919, pp. 105-141. [Received 2nd December 1920.] 



As an attempted remedy for an infestation of Epelis iruncataria 

 v3S.faxonii, Minot (cranberry span-worm), a cranberry bog was flooded 

 in 1917 on 20th June, while the moths of both sexes were numerous. 

 The water was drawn off three days later, and had either destroyed or 

 driven ashore all the moths, ver}' few being seen afterwards ; but it 

 apparently did little or no harm to the eggs that had been laid 

 previously, and larvae were numerous on the bog in July. These were 

 treated once while young with 6 lb. lead arsenate paste to 50 U.S. gals, 

 water ; this remedy proved effective, and very few were found when 

 the bog was swept with a net a few days later. On one bog where the 

 winter flood had been held until nearly June the pupae survived the 

 long submergence, and the infestation was severe in August. 



Grubs that were found occasionally in great numbers in the sandy 

 covering of cranberry bogs were thought to be those of Amphicoma 

 viilpina, Hentz. (cranberry root grub), as adult beetles of both sexes 

 of this species were found associated with them. These grubs were 

 injurious in much the same way as the root worm, Rhabdoptenis 

 picipes [R.A.E., A, vi, 553], cutting through the smaller roots in 

 circular or irregular patches. Bushes so infested frequentty remain 

 sickly and give a poor crop for several years, or die suddenly in patches 

 during hot, dr\' weather. It probably takes two or three years for 



