Gabriele Stoll
Natural Crop Protection in the Tropics
Letting Information Come to Life
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Methods of Storage Protection
Storage-Pest controlling Plants
--Velvet leaf
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Methods of Storage Protection
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Storage-Pest controlling Plants
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Velvet leaf
Cissampelos owariensis
Fam. Menispermaceae
1. General
Plant parts with pest-controlling
properties
Leaves, roots
Mode of action
Insecticidal
Target insects
Storage insects
Rice weevil
Larger grain borer
Remarks
The velvet leaf is extremely
bitter, therefore this treatment is suggested for application
on planting seed only.
Velvet leaf controls the larger
grain borer Prostephanus truncatus and the rice weevil
Sitophilus oryzae more effectively when applied as slurry.
Methods of preparation and use
The slurry is made by weighing out powder
and adding sufficient water to give a desired concentration
(weight/weight), and stirring until a smooth paste is obtained.
Then the grain is poured into the prepared slurry and stirred
thoroughly to make sure that the grains are perfectly covered.
Using the slurry method is more effective than plant powder
only. A slurry at a 2.5% concentration reduced the weight loss
of the stored goods to 7.9% compared to 68% in the control over
a period of 3 months. There was no difference between the 2.5%,
5% and 10% concentration.
To control the larger grain borer
effectively (< 3% weight loss, 90–100% mortality of
the borer), a 10% concentration is required. The rice weevil,
however, can be completely controlled with a concentration of
1% only.
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