- lU - 
The' Wageningen PlantenziektenkuncCigcn Dicnst (U03) in 193^ re- 
ported that an aqueous suspf^nsion of rotenone (l:10,000) is effective 
against adults and larvae of the raspterry 'beetle, 
Amos, Beard, Moore, and Painter (lO)in 1935 stated that a proprietary 
derrig powder, 2 pounds plus soft soap, 5 pounds por 100 imperial gallons, 
was sprayed on raspberries en June 26, 193^, against B. tomentosus ^ as part 
of the routine spraying program for that year. 
Steer (l02) in 1935 reported that finely ground derris (crude 
rotenone = 3»63 percent or recrystallized rotenone = 2.92 percent) was 
applied as a spray, 2 pounds to 100 impf-rial gallons of water, and as a 
dust diluted with chin?, clay. A single spraying of derris and soap gave 
inadequate control of the larvae on raspberries. A single application 
of a derris dust, applied late in May to control the adult stage of the 
raspberry and loganberry beetle, failed to give satisfactory results on 
raspberries, even when the rate of dusting Was about 3 cwt. per acre and 
the crude rotenone content of the dust as high as O.36 percent. On logan- 
berries, derris gave as good result? when incorporated in a spray of lime- 
sulfur and sulfite lye, or of colloidal copper and sulfite lye, as when 
used with soft soap, A small-scale trial on Himalaya berry confirmed 
last' 'season' s finding thait a single application of derris and soap can 
satisfactorily control the pest on cultivated blackberries, 
G-ra;^- and Brooks ( 166 ) in 1935 reported spraying trials against 
the raspberry beetle in England. A liquid derris wash ga-"'e better con- 
trol than barium fluosilicate or nicotine. Two applications were suffi- 
cient, one during the opening of the buds, the other during petal fall. 
Applications consisting of a combination of dusts and a wash gave con- 
sistently inferior results. Derris dust was ap;^lied when the buds were 
opening and when fully open, and a derris wash when the petals were falling. 
Harris ( l79 ) , of the East Mailing Research Station in England, 
reported in 193^ that a spray of 2 po^inds of finely ground derris root 
and 5 pounds of soap in 100 imperial gallons of water caused a 90-p'^r- 
CF-nt reduction in injury by the raspberry b'-etle. 
B. tomentosus is sensitive to derris dust. This is one of the 
firpt insects in the Netherlands to bo successfully controlled vrith derris.— 
DeBussy et al. (61) in I936. 
Carroll (67) in 193^ reported the results of tests in the Irish 
Frc^ State with derris against the raspberry beetle. Sprays of derris 
poWvler plus coconut oil soap, or of derris preparations containing a 
spreader when diluted to a rotenone content of 0,005 percent and applied 
twice (first, about 2 weeks after flowering had begun and second, 10 days 
later), resulted in 99 percent of the bf^rrirs being free from larvae. 
Fryer ( 1U9 ) in I936 reported on insect pests of crops in England 
and Wales fo- 1932-3^' and methods for their control. The success obtained 
in earlier ezprrimehts on the control of the raspberry beetle by means of 
derris sprays and dusts has been confirmed by further work; and the treat- 
ment of rappberrieg, loganberries, and cultivated blackberries vrith derris 
preparations has bpcome a routine method in fruitgrowing areas. 
