8 
The Apple-tree Bark Louse. (Prairie Farmer, May 14. 1870, v. 41, p. 146.) 
Mentions important questions regarding this insect "which yet remain 
unanswered, and discusses the following three: Does it ever locate itself 
on healthy trees? Does it multiply more rapidly upon some varieties 
than upon others? Are there any varieties exempt from it? Some insects 
attack healthy trees: a large number hasten the removal of dead or decay¬ 
ing trees; and a small class hold an intermediate position, attacking trees I 
that become weak or sickly. Examples given. Many think this bark 
louse of the latter class. Opinions cited for and against. Some varieties 
of trees are peculiarly congenial to certain of their insect enemies. Observa¬ 
tions indicating that this applies to the bark louse are given, and the sug¬ 
gestion is made that orchards and nurseries be examined and reported on 
in order to settle the question. 
Paris Green for the Colorado Potato Beetle. (Prairie Farmer, May 28, 1870. 
v. 41, p. 101.) 
This remedy has sometimes failed from not having been properly ap¬ 
plied. It should be mixed with flour, the usual proportions being one"part 
of Paris green to six of flour; although it has been found effective in the 
proportion of one to ten. Mentions a case where it was used successfully: 
on a large scale. 
Insects Injurious to the Pear-tree. (Prairie Farmer, .June 4, 1870, v. 41. 
p. 170.) 
Insects received from Villa Ridge [Ill.]. One of them, Helops aratus , 
Say, devours the terminal buds and sometimes the tender shoots. Had 
left the trees by May 5. The allies of this very rare species are none of 
them injurious to plants. Two others, the grape-vine Fidia and the flea-like 
negro-bug fed readily on pear leaves supplied them. A fourth, supposed 
to be the tent caterpillar of the forest, is not usually considered as a seri¬ 
ous pest, though it sometimes strips oak and apple-trees of their foliage. 
Hand picking, jarring from trees, and dusting foliage with lime recom¬ 
mended. 
plies to Correspondents upon Noxious Insects. (Prairie Farmer, June 18. 
1870, v. 41, p. 186.) 
Orgyia leucostigma.— Inferred to be unusually prevalent this summer. 
Various stages described. Remedies: hand picking of egg masses: jarring | 
trees; dusting trees while wet with lime or ashes/ 
Gooseberry worms.—Paris green recommended. 
Lady-bugs.—Found eating eggs of potato beetle. 
Correction.—The supposed forest tent caterpillar of the article of June ! 
4 is some other species. 
Answers to Correspondents. (Prairie Farmer, June 25, 1870, v. 41. p. 194.) 
Currant Worms.—Identified as Ellopia T ribearia. Evidently the same as 
those mentioned June 18. They are perhaps the worst enemy of the 
gooseberry and currant, and are difficult to destroy. Suggests syringing 
the bushes with carbolic acid. Larva and moth briefly described. 
Large Gray Snout Beetle.— Itliy cerus noveboracensis, —a not verv injurious 
insect. Common on fruit trees and oaks. May be jarred from" trees like 
other cureulios. 
Reports specimens of Ctenucha reared from cocoons found under rough 
bark of the apple-tree, woven with black and white hairs, showing that, 
it has a hairy larva. 
Paris Green. —(Prairie Farmer, June 25, 1870, v. 41, p. 196.) 
Cautions against careless use because of two cases of poisoning com¬ 
ing to his knowledge. Precautionary measures: (1) Dilute with at least 
six times its bulk of flour. (2) Be careful not to have the wind blow it 
towards you. (3) Have the utensil in which it is used tied at the end of 
