32 GUAM AGRICULTURAL EXPERIMENT STATION. 



doDterous larva, bores in the stems, and .produces serious injury to 

 the plants. 



Cotton. Cotton is not extensively grown. Nevertheless some at- 

 tention was given to the insects. The plants are often badly infested 

 wiih mealy bugs Pseiidoeoccuti virgatus, plant lice, Aphis gossypil^ 

 and Aphis sp., and armored scale, Saissetia nigra. Aphis gossypii is 

 heavily parasitized by a minute chalcid, Aphelimis sp., and is also 

 kept in check by the common ladybird beetles and predaceous larvae 

 of a syrphid fly Xanthogramma grandicomis. The most injurious 

 pest is a stem borer, probably Farias fahias, which weakens the 

 branches and causes frequent breaking. 



Ceara rubber. A mealy bug, Pseudocoocus virgatus, and a soft 

 scale, Saissetia nigra^ are found on Ceara rubber trees. 



Cassava. No pests w^re observed on cassava. 



Kapok. An armored scale, Saissetia nigra, is found on the 

 leaves of the kapok. It is parasitized by Tomocera sp. 



Bamboo. Asterolecanium hambusce is \Qvy common on bamboo 

 stems. It also is parasitized, 



HEDGE, SHADE, AND ORNAMENTAL TREES, 



Camachile Pithecolohium dulce (PL V, fig. 3). This leguminous 

 plant is being used for hedges. The foliage is destroyed by a leaf 

 folder, the larva of a microlepidopterous insect. An armored scale 

 is found on the bark. 



Ironwood {Gasuarina sp.). This tree is often badly infested with 

 fluted scale, Icerya purchasi, although Scymnus sp. is very active in 

 reducing the infestation. 



Cassie. The stems are bored by the larva of the tortricids, Crypto- 

 phlehia illepida, and of a tineid. 



PESTS OF DOMESTIC ANIMALS. 



Fortunately none of the serious animal diseases so common in the 

 Philippines and other tropical regions are prevalent among the 

 Gu&m herds and domestic animals. The Australian cattle tick, 

 Margaropus anmdatus austmlis, and the common carabao louse, 

 nematopinus tuhercidatus, how^ever, are commonly found on carabao 

 and oxen. As the tick is also said to be an intermediate host for the 

 Piroplasma of Texas fever, its presence in Guam is more or less of 

 a menace, especially in view of the introduction of animals from 

 other regions. Both, moreover, are great annoyances to the cattle 

 and when numerous affect the condition of the animals. Some 

 relief may be secured by spraying with Zenoleum. Chickens also 

 aid in the reduction. An ant, said to be the common fire ant (Sole- 

 nopsis geminata subsp. rufa) is a great menace to cattle and sheep 



