28 GUAM AGRICULTURAL EXPERIMENT STATION. 



in their outer |)()rtions and in the protection thus aii'orded eats 

 throu<rh the leaf to tlie h)\ver epidermis. Plants in all sta<!:es of 

 growth are attacked by leafhoppers {Peregrinus rtiaidis) and plant 

 lice {Aphis maidis). When the stems are formed the plants are 

 attacked by a moth borer, a sordid white caterpillar with conspicuous, 

 small tubercles. This is the larva of a pyralid moth recently de- 

 scribed from the Philippines by Schultze as Pyrausta vastatrlx. The 

 borer is also commonly found in the ears. In both stems and ears it 

 pupates within its burrows, which are readily noticed by the accumu- 

 lations of frass at the entrances. The ears are also badly eaten by 

 the noctuid larvae Tleliothh ohsoJeta var. Melanitls leda was also 

 bred from the caterpillar, which was collected on a corn leaf. Dam- 

 aged ears harbor the usual insects attracted by fermentation and dry 

 dead vegetable matter. Nitidulid beetles {Carpophilus maeulatus 

 and Epurwa Ivteola)^ a small cockroach (probably Phyllodromia 

 sp.), the coffee bean weevil, Anecems fasciculatus, and a small tineid, 

 were quite commonly found in such situations. A large locustid 

 is also found on the foliage and is probably predaceous on plant 

 lice and hoppers, although it also occasionally nibbles at the foliage. 

 The aphidids or plant-lice and hoppers are commonly attended by 

 red ants and are preyed upon by several coccinellid beetles {Har- 

 monia arcnata^ CocemeUa repmida^ and Dmd'ts mulsanti) as well 

 as by the larva of a syrphid fly (probably Xanthogramma grandi- 

 coimis) and of a hemerobiid. Probably the most serious corn pest 

 is the grain weevil, Cnlandra oinjza^ which attacks the dried stored 

 seed and often does considerable damage to the crop. Rodents are 

 nearly as injurious (to the standing crop) as the weevil. In many 

 fields at least a third of the ears were eaten wholly or in part. Noth- 

 ing is recommended in the way of artificial control, as the benefit 

 derived from the use of insecticides on growing corn would scarcely 

 repay the expense involved. The protection of the fields from rodents 

 is very necessary. The seed weevil is very easily controlled by sun 

 and heat drying, careful storage, and fumigation. The plant louse 

 and leafhopper are both parasitized in the Hawaiian Islands, but no 

 parasites were reared from them in Guam. 



Coffee. The coffee plant sems to be particularly free of insect 

 pests. A few common coccids, Pidmnaria psidii, Saissetia heini- 

 spherica, a Diaspine species, and Psetidococcus sp. were the only 

 pests taken on it. Occasional spraying with kerosene emulsion or 

 scalecicle is recommended. 



Rice. All that was seen of this crop was stubble and some volun- 

 teer stems. Planting was just beginning in September. Mr. 

 Thompson, however, states that there are no serious pests. A mealy 

 l)ug. Pseudococcus sp., is commonly present between the stem and 

 leaf sheath. Cutworms and the rice weevil are likely to do some 



