Deguelia malaccensis (Benth.) Blake
Derris cuneifolia malaccensis Benth.
Derris malaccensis (Benth.) Prain
Derris montana Benth.
Paraderris montana is a climbing shrub, producing stems 15 metres long or more[
A source of the insecticide derris, the roots are harvested from wild and cultivated plants for use as a fish poison and insecticide[
]. The plant is cultivated, mainly in Malaysia, Borneo and India, less frequently also in other countries of tropical Asia, Tonga and the West Indies[
]. Most widespread is the cultivar 'Sarawak erect'[
The roots contain the pesticide rotenone - the active ingredient in derris[
]. This is an effective poison for fish and other cold-blooded creatures.
Southeast Asia - Myanmar, Thailand, Malaysia, Indo-China, Indonesia, New Guinea.
Riverine rain forest, at elevations up to 250 metres[
|Other Uses Rating||
|Cultivation Status||Cultivated, Wild
A plant of the moist tropics, where it is found at elevations up to 1,580 metres. It grows best in areas where annual daytime temperatures are within the range 22 - 30°c, but can tolerate 20 - 34°c[
]. It prefers a mean annual rainfall in the range 1,800 - 2,000mm, but tolerates 1,500 - 2,500mm[
Succeeds in full sun and in light shade[
]. Succeeds in a wide range of well-drained soils of low to medium fertility[
]. Prefers a pH in the range 5.5 - 6.5, tolerating 4.5 - 8.5[
Toxicity of the root is usually highest 19 - 27 months after planting and at this state the roots are harvested[
]. In some areas 15 months of growth is sufficient[
Plants do not produce seed in the first 30 months after planting[
Used for soil improvement, and is grown for this purpose in rubber and cocoa plantations[
The roots are used as insecticide[
]. The principle active ingredient is rotenone, but the content found in the roots is less than that found in Derris elliptica, but the content of other toxic compounds is higher[
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