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The Koloniaal Insti trait (250) of Amsterdam in 1935 quoted the above 
Milsun and Goorgi (283) , in" 1937 reporter! on dorris cultivation in 
Malaya. They. wro te : 
"While at present the extent to which toxicity is an 
inherent character is uncertain, there are indications that 
the proportions both of rotenonc and of ether extract renain 
constant within Units for successive ©iterations. Should a 
much closer relationship bo found to exist, the value of.. 
clonal material v;iil be of the greatest inportancc since it 
will pemit of the export of a standard product. This will 
enable dcrris to withstand competition fron other vegetable 
insecticide?; possessing toxic principles of a similar nature, 
notably cube root (L oncho carpus spp.) fron South America." 
Peru . — Page (313), chief of the Agronomic, Station of Loreto, Peru, 
in August 1335 published an account of the growing of barbasCo in that 
province. Hua.sco barbasco ( Lonc ho carpus niccu ) is richer in rotenonc than 
the species known as sacha barbasco, la<:arto barb.asc^, tirano barbasco, 
etc., in nOst cases containing fron 5 to 15 percent of this constituent. 
A region that is less hunid and less hot than that along the rivers 
is favorable to a high rotenonc content in barbasco. In the Agroronic 
Station it has been observer 1 that the hnasca. barbasco plants which are 
planted in rotation with yucca plants behave nuch better than those planted 
free, in the open without any plants to shade them. The farmers' in the neigh- 
borhood who cultivate barbasco on their land agree that it is necessary to 
"protect the plants against bright sunlight especially in the first months of 
grow th. 
The natives of the region use various ways ox' planting huasca barbasco; 
some plant two pieces of roots at a distance of one to two meters and others 
place various pieces, sometimes up to eight or ten, in one row with grca.ter 
distances up to four -actors between each row. 
Barbasco roots, when pulled up, contain, moisture according to the 
time of harvesting and the nature of the soil. The root taken from a single 
plant, 1-1/2 years old, growing in the region of San Juan weighed one kilo 
at the moment of extraction from the soil (plants at this age commonly 'pro- 
duce in this region more than -1 kilos of root per plant), and 575 grans 
after the roots had been stored for about 15 days in the open air but in a 
shady place. These roots were harvested and dried during April-May, which 
is a. vory ra.iny period. The experiment was repeated in August when there 
was dry weather, with roots of another plant growing at the sane place and 
of the sane age. Then the roots wore pulled, up they weighed 1.8 kilograms 
and. af ucr 15 days 1.54 kilograms. The trad.ors usually make a deduction of 
20 to 50 percent in the price to cover loss in weight when they purcha.se 
fresh ba.rba.sco. 
