-154- 
A heavy infestation of mites (the brown almond mite and the two- 
spotted mite) built up in three almond trees that were sprayed with 1 
pound of DDT per 100 gallons of water, which soon evidenced severe 
injury. As the season progressed, the trees immediately adjacent to 
the DDT-treated trees showed an inorease in the mite population — un- 
questionably because of migration from the three sprayed trees. The 
sprayed trees finally suffered complete defoliation, whereas those in 
the main portion of the orchard retained their leaves. —Swans on and 
Michelbacher (340 ). 
Tetranychus pacificus McG., the Pacific mite 
At the dosages required for codling moth control, DDT apparently 
is not toxic— Baker and Porter (81). 
Tetranyohus sohoenei McG. 
Same as Par at et rany ohus pilosus .— Hough (217 , 218 ) • 
Tetranychus wi Harnett el (McGregor) , the Willamette mite 
At Hood River , Oreg», during September, a notioeable inorease of 
mites occurred on DDT-sprayed trees. The infestation caused notioeable 
yellowing of leaves, particularly on the lower inside areas of the 
trees .—Childa and Robinson (ill )* 
Tetranyohus spp«, common red spiders 
A 3-peroent DDT dust was ineffective .--Haseraan (203 ). 
Greenhouse tests » DDT applied at rates of 1 pound per 100 imperial 
gallons of water and higher, both powder suspensions and in Velsicol 
emulsion, has shown no apparent effect on this mite.— Ross (306). 
Red spider seriously damaged bean plots treated with a 3 percent 
DDT dust or a spray containing 1 pound of DDT in 100 gallons of water. 
—N. J. Agr. Bxpt. Sta. (275) . 
In a Bartlett pear orchard in the Sacramento River area of California 
red spider injury appeared earlier and was more severe in DDT-treated 
plots than in the remainder of the orchard receiving the regular program 
of lead arsenate and dinitro.— Borden and Jeppson (91). 
A heavy application of Gesarol A-3 dust to oantaloup in a greenhouse 
wa3 ineffective against red spiders and severely burned the leaves.— 
Ewart (145). 
In tests on eggplant in Nebraska red spider mites began to show up 
on the DDT-treated plots late in the season and they soon increased to 
