= Om 
TRUCK CROP AND STORED PRODUCT INSECT INVESTIGATIONS. 
F. H. Chittenden, In Charge. 





























_ Referring to the same species mentioned in the October number of 
ne Bureau letter, page 6, it has been observed of the cabbage looper 
lutographa brassicae) that it has different habits according to the 
gion in which it occurs, due doubtless to climate, heat and cold, 
d environment. This species can be easily controlled in Tidewater, 
nt it is more difficult to destroy in the Atlantic region of the 
orth. There is no evidence that when this species occurs in Tide- 
ater Virginia that it can not be controlled by almost any spray 
ince the conditions there are quite favorable for infection by a 
acterial disease. The combination of the disease and poisons kills 
high percentage. 
An article has recently been published by the Virginia Truck 
iIxXperiment Station on the control of injurious aphides or plant-lice 
vy ladybirds in Tidewater Virginia. This matter was first suggested 
nd begun by the writer in 1909, first on a small scale and afterwards 
na larger scale. Tt has been practically completed by Mr. D. HE, 
Munk, the author of the article, this winter. It appears to be a 
jomplete success as regards the spinach aphis and aphides in general, 
wactically no trouble has been experienced over large areas. 
he species are the convergent ladybird (Hippodamia convergens), and 
the spotted ladybird (Megilla maculata). The convergent ladybird is 
ble to adapt itsel? to almost any plants where aphides are present 
und apparently it naturally inhabits all of our States although it is 
tot abundant or so active in the extreme north. There it may be re~- 
jlaced by some other species but this has not been thoroughly tested. 
Srior to the introduction of these ladybirds the spinach erop--which 
$ a very important one in Virginia--suffered severely, and growers 
rere abandoning its culture as no Girect remedies were discovered 
after years of study. Because of the close proximity of the spinach 
fo the ground under-spraying was practically useless on a large scale. 
