GUAM AGRICULTUEAL EXPERIMENT STATION. 31 



Papayas. No pests were noticed on papayas. 



Roselle. The larva of a tortricine moth does considerable damage 

 to this plant. 



VEGETABLES. 



Sweet potato (PI. V. fig. 1). Sweet potato plants are badly 

 blighted b}^ a fimgus disease. Tavo common sweet potato weevils, 

 Cylas fomfiicarius^ and Euscepes {Cryptorhynehis) hatatm are 

 abundant and do considerable damage to the crop. A Pulvinaria 

 on the leaves resembles P. tyleri in the Philippines. 



Eggplant. The foliage is badly infested with plant lice, probably 

 Aphis gossypil and mealy bugs, Pseudococcus virgatus. 



Beet. Beet plants are subject to the frequent attacks of a defoli- 

 ator, the beet web worm, Tlymenia fascialis. An Apanteles com- 

 monly parasitizes the larva and a carabid beetle {Chlmnius higut- 

 tatus) preys upon it to some extent. Plant lice. Aphis sp., commonly 

 infest the foliage. Spraying with arsenate of lead at frequent inter- 

 vals would do much to reduce the webworm injuries. 



Cucumber. The foliage is commonly infested with plant lice that 

 resemble Aphis gossypii. 



Radish. The plants are commonly attacked by plant lice thought 

 to be Aphis gossypii and the imported cabbage worm, Helhda un- 

 dalis. The roots are often very badly damaged. Repeated sprayings 

 at intervals of 15 days with arsenate of lead is recommended. 



Cabbage. Cabbages fail to head in Guam, and for that reason 

 are little grown. They are commonly attacked by the caterpillar of 

 a pryalid moth. 



Horseradish. Horseradish is attacked by the same pyralid and by 

 the imported webworm, Hellula undalis. 



OTHER ECONOMIC PLANTS. 



Cacao. There are a few old cacao plantations on the island which 

 have practically been abandoned since a typhoon of some years 

 ago. An examination was made of one of these plantations. The 

 general condition of the trees showed neglect. Some were putting 

 out a small new growth, but practically all appeared to be in slow 

 decay from the roots up. The bark was loose and riddled; beneath 

 it the work of ants, termites, and scolytid beetles could be noticed. 

 A damaged specimen of a longicom was rescued with proctotrypid 

 cocoons adhering. These bred a new genus near La^lius, but the 

 grub was beyond identification. The foliage showed fungus attack. 

 A caterpillar common on dead wood was also found, but the moth 

 was not bred. Captain Duarte, an old resident, vouchsafes the in- 

 formation that a large borer seasonally attacks cacao; it is a lepi- 



:SI1HH«»«TI«0!' 



