1069 
it will have bored through several nodes and have found lodgment in the 
third joint from the top or near the ground. The adult of this insect 
has not been reared. 
CORN AND SORGHUM INSECTS. 
Both of these plants are attacked to some extent by the rice army worm, 
but corn has a special enemy in the form of the stalk borer (Pyrausta 
vastatrix Schultze, MS.). Sometimes as many as three or four of the 
larve are found in the same cornstalk. Plants so attacked seldom bear 
fruit. 
Sorghum, with which cultural experiments are being carried on at the 
experiment station here, is affected when in bloom by a tiny, unidentified 
Cecidomyid, the female of which lays as many as twenty or thirty eggs 
in a single spikelet. Last year the seed production of the plants was 
lessened as much as 80 per cent by the ravages of this insect. 
COCONUT INSECTS. 
Being one of the chief industries in the Philippines, the cultivation of 
coconuts when menaced by insect attacks assumes a discouraging aspect. 
There are not many very serious pests found upon this very useful tree, 
but those that do attack it bring about the most sinister results. Its 
principal enemies are the rhinoceros beetle (Oryctes rhinoceros Linn.), 
the Asiatic palm weevil (Rhyncophorus ferrugineus Fabr.), and the trans- 
parent scale (Aspidiotus destructor Sign.).2 It has been found that the 
only effectual means of contending with these pests is constant vigilance 
to prevent their entrance into a plantation and, when present, to rid the 
trees of them before they can do serious damage. Clean cultivation, to- 
gether with moderation in the matter of removing dead leaves from 
coconut trees, has proved the most effective mode of procedure in this as 
well as other coconut-growing regions. 
SUGAR-CANE INSECTS. 
This staple Philippine product is exceptionally free from insect attacks 
other than that of locusts. One species of stalk borer (Aphodius sp.), 
a beetle, which, as larva and adult, gives occasional trouble in the Island 
of Negros, and a-species of Aleurodid, are the only pests worth mention 
in this connection. Our greatest energy with reference to this plant will 
be used in the prevention of possible future importation of infected “seed” 
cane from regions such as Hawaii, where the sugar-cane leaf hopper 
(Perkinsiella saccharicida Wirk.) has done so much damage. 
* For a full account of these insects see Phil. Journ. Science (1906) 1, 143-165 
and 211-236. 
