
iG a 
the starting line, this tendency being rather small at the end of 7 
days but so pronounced after 27 days that 21 of the 95 grubs recovered 
had travelled more than 16 inches, and 6 of them had reached the edge 
of the box, after travelling a distance of at least 24 inches. Grubs 
were found at every level from the top inch of soil to the bottom of the 
bin with a slight concentration at the 6 and 7 inch depths. The mortality 
.was less thanl percent, in spite of the fact that no food was supplied." 
M. R. Osburn, reporting on experiments in the control of Japanes¢ 
beetle larvae with lead arsenate, says: "Generally speaking from the 
preliminary data there is not a consistent reduction of grubs at this 
time in plots receiving less than 10 pounds of lead arsenate to 1,000 
square feet. Also, it seems that hydrated lime in combination with lead 
arsenate reduces the toxicity of lead arsenate to the grub." 
TRUCK AND GARDEN CROP INSECTS 
Reporting on vapor heat treatments of commercial stocks of bulbs, 
Randall Latta, Sumner, Wash., says: "Iris bulbs were treated at week- 
ly intervals throughout the summer at a standard temperature of 111° F. 
for four hours. Samples were planted in flats and covered outside on 
October 12. The flats were uncovered and brought into the greenhouse 
(cool house) on December 21. The top growth of the different treat— 
ments showed marked variation and they were measured on December 28. 
**x * There is noted a marked difference in the effect of the treat— 
ments on the two varieties (Imperator and Yellow Queen). These figures 
(submitted) indicate particularly the effect of the treatment on the 
initial or starting growth. Generally a retardation is noted. In In- 
perator this retardation increases almost directly with the increase 
in the interval after digging. except for the one rise of the August 20 
treatment lot. In Yellow Queen there is a wavering up and down, indi- 
cating a possible periodic function." 
L. B. Reed, Chadbourn, N. C., summarizing a study of the straw- 
berry root aphid (Aphis forbesi Weed), says: "Several months of obser- 
vation in the same field seems to indicate that there is little relation- 
ship between foliage infestations and root infestations of A. forbesi, or 
between the foliage infestation of the aphid and the dying of plants. 
The data collected do indicate, however, that a heavy infestation of 
Lasius niger neoniger (cornfield ant) in the spring is followed by a 
heavy infestation of A. forbesi on strawberry roots, a high mortality 
of plants during the dry season, and a corresponding decrease in the 
runner plant production during the fall and winter." 
Charles E. Smith, Baton Rouge, La., gives additional data on the 
migration of the spotted cucumber beetle (Diabrotica 12-punctata Fab. ). 
He says, "by the first of the month the beetle population had shifted 
very largely from the fall-flowering weeds to cultivated crops. On 
December 4 a migration flight was observed in progress a few miles south 
