42 BULLETIN" 1329^ TJ. S. DEPARTMENT OF AGKICULTTJEB 
BAMBOO PLANT-LOUSE 
The adult plant-louse, known as Myzocallis ayntndicolens Clarke, 
is about one-tenth inch long and pale yellow in color. Under the 
microscope the antennae, sides of the thorax, two rows of tubercles 
on the abdomen, the wing veins, and feet are light brown or dusky. 
The yoimg forms show little or no markings. The species is found 
almost everywhere that bamboo is grown. It has been collected at 
Berkeley, Santa Barbara, San Francisco, and Sacramento, and prob- 
ably occurs generally in central and southern California. It is found 
on the under sides of the leaves or blades of bamboo, often in large 
colonies, and doing much damage by weakening the plants and 
causing a smutting of the foliage. 
The nicotine-sulphate soap solution mentioned under the preced- 
ing species is very valuable in combating plant-lice. 
BAMBOO MITE 
Bamboo in Florida and California is infested by this creature 
{Stigmaeop^is celarkis Banks). This animal somewhat resembles in 
appearance the red spiders of the genus Tetranychus and makes 
small white webs on the bamboo. It chiefly infests Phyllo- 
stachys, but is also sparingly found on several related genera. No 
native vegetation has been found attacked. 
The injury caused by the mite does not appear to oe serious; no 
bamboos are recorded as killed or suffering severely, and the species 
is not noted as injurious in Japan, its native home. 
The mites are confined to the leaf sheaths for from 8 to 10 months 
and are not found on the stems near the groimd or in rhizomes or 
parts of the plant below ground. The migration period of the mite 
occurs in May and June. 
For control in propagation the rhizomes of the preceding year's 
growth should be lifted in November and December, when the plants 
are dormant, selecting those rhizomes containing living eyes or buds. 
These should be treated by immersing them for 10 minutes in hot 
water at 122° F. and then heeling them in sand previously heated 
to 167° F. for one hour, or in sawdust, and kept cool until planting 
time in the spring. 
PRIONID ROOT-BORER 
At Burroughs, Ga., a bamboo grove is reported as infested by a 
prionid root-borer {Prionus sp.). This roundheaded larva feeds on 
the roots and rhizomes of the bamboo, but the injury does not appear 
to be very serious. Too little is known of this insect to justify any 
suggestions for control here. 
JAPANESE SHEATH MITE 
(Tarsonemus ham'bumrkim Banks) 
In addition to the foregoing insects, the writer of this bulletin 
desires to call attention in a brief way to a mite which has been under 
observation and study at the Brooksville Plant Introduction Garden 
since the spring of 1917. This mite was discovered by David Fair- 
child, who made brief notes on its appearance and numbers. During 
