
1913] CURRENT LITERATURE 241 
of the life history of the organism, methods of distribution, and methods of 
control. 
The potato eelworm is the subject of a brief paper by Esstc.?5 He describes 
the disease and the organism and suggests treatments. The disease is of such 
great importance Pe California has established a quarantine against potatoes 
from spate distr 
recen celanedion from Europe is reported by CRAwForpD.”* It is 
Triozoa alacris Flor., which causes a rolling and distorting of the leaves of 
Laurus nobilis and other species of Laurus. 
The olive knot is the subject of a very interesting paper by Horne” 
This disease is restricted to the olive, and is due to Bacterium savastanoi E. F. 
Smith. It causes knots very similar to the crown gall, but restricted entirely 
to the branches. It is distributed by means of a slime which oozes from the 
galls during the rainy weather. Inoculation may occur through natural 
cracks in the bark. 
AWCETT™ describes some very interesting citrus galls from Southern 
California. He believes them to be different from the Jamaica lime and 
orange knot, which is due to Sphaeropsis tumefaciens Hedges. 
One of the most interesting-cecidia is reported by AMUNDSEN,” who found 
it on wistarias imported from Japan. It occurs on the stems at the base of 
the buds and in most cases causes the death of the affected buds. Only the 
pink-flowered plants were infected, and in commenting on this point the 
author says ‘‘ whether the fly which laid the eggs discriminated against all the 
plants which ultimately would produce flowers of other colors and could pick 
out the pink, or whether the pink varieties were grown in a erent locality 
than the others, could not be ascertained and is still a myste 
Houser describes a gooseberry gall as follows: “The silent is injured 
by the insect working during the larval stage in the terminal buds of spurs and 
branches, causing the buds to become abnormal both in size and structure. 
The bud scales increase greatly in number and size, and lying closely one upon 
another form a gall somewhat resembling in miniature the — cone willow 
galls so commonly encountered upon the tips of willow twigs.” Secon 
buds are produced and become infected, thus forming a cluster of small cone- 
shaped galls. The shoots from these galls give a witches’ broom effect. The 
** Essic, E. O., The potato eelworm. Monthly Bull. State Comm. Hort. (Cal.) 
1326-30. 1911 
- sivas: D.L., A new insect pest. Op. cit. 1:86, 87. 1912. 
*7 Horne, W. T., The olive knot. Ibid. 1:592-600. 1912. 
* Fawcett, H. S., Citrus galls. Ibid. 1:937-940. 1912. 
* AMUNDSEN, E. O., Wistaria gall fly. Ibid. 1:730-733- 1912. 
%* Houser, J. - The gooseberry gall midge or bud deformer. Jour. Econ. 
Entomol. 5:180-18 
