hy ENS 
TRUCK CROP AND GARDEN INSECTS 
Mexican bean beetle migrates through mountain passes.——Reporting 
on the life history and habits of Epilachna corrupta Muls., J. R. Doug— 
las, Estancia, N. Mex., says: "Beetles began their fall migration the 
latter part of August. The most intensive period was from September 8 
to 17, inclusive, when 842 beetles were trapped in Tajique Canyon on a 
screen coated with a sticky tree-banding material, 430 beetles were 
trapped flying up the canyon, and 412 flying down the canyon. Observa— 
tions in foothill canyons indicate that after the beetles enter the can-— 
yons there is considerable movement up and down the canyons before the 
beetles enter hibernation. On September 26 migration up foothill can-— 
yons was still under way. The last eggs were noted on September 21, 
and at the close of the month few larvae and pupae were noted in the 
fields. A few overwintered beetles are still living. * * * On September 
26, J. G. Shaw observed a beetle on Bosque Mountain at an elevation of ap-— 
proximately 9,000 feet. As the crow flies this beetle was 6 miles from 
the nearest bean patch in the canyons and 10 miles from commercial plant- 
ings. The above observation indicates that the Mexican bean beetle is 
capable of crossing or migrating through mountain passes." 
Entrance of Tarsonemus mites into tissue of Delphinium.—-F. F. Smith, 
of the tropical greenhouse, Washington, D. C., has made "an interesting 
leaves. The mites enter through cracks in the epidermis which develop 
as the epidermis shrinks following the usual surface injury caused by 
their feeding. They were observed to have worked their way from the en— 
trance for 1/16 to 5/8 inch along the loose mesophyll cells. The cells 
that they have fed upon become black, and this color is visible through 
the epidermal layer. This internal feeding of the mites may be the cause 
of the so-called 'blacks' observed on mite-injured larkspurs. In two 
tests immersion in hot water at 111° F. for 10 and 15 minutes, respec 
tively, killed all stages." 
Molasses increases toxicity of nicotine sulphate to hatching lar- 
ons eres unease rocaastnenn seca eno 
—— ae 
who has been studying the residual action of nicotine and nicotine sul-— 
phate combination sprays toward hatching larvae of Taeniothrips gladioli 
M. & S., reports that the following conclusions have been reached: "Where 
nicotine is in a volatile form such as free nicotine or nicotine sul-— 
phate soap, the residual action is apparently negligible, in fact much less 
than where nicotine sulphate alone is used. Nicotine sulphate alone is 
slightly effective. By combining nicotine sulphate with other substances 
(waste sulphite liquor, brown sugar, or molasses) it is apparently pos-— 
Sible to retain it much longer on the foliage and its effectiveness against 
hatching thrips larvae is definitely increased. The data with molasses— 
nicotine sulphate are still meager, but even here this combination shows a. 
decided increase in effectiveness. Apparently, this molasses combination 
is superior to either nicotine sulphate-waste Sulphite liquor or nico-— 
tine sulphate-brown sugar. The better wetting and covering ability 
of molasses might explain this increased effectiveness." 
