Plants in pest control
- Guinea hen weed
- Flour spray
- Soap spray
Precautions: Soap spray, undiluted alcohol and solution of water + alcohol, ammonia spray may injure foliage. Test sprays on few leaves before applying to entire plant. It may take 2 days for damage symptoms to appear.
- Sticky board traps. Traps give early warning and serve as natural control method.
To use, place 1 to 4 yellow sticky cards per 300 square meter field area. Replace traps at least once a week. It is difficult to determine the population of newly trapped whiteflies on a sticky card to those previously trapped ones.
To make your own sticky trap, spread petroleum jelly or used motor oil on yellow painted plywood, 6 cm x 15 cm in size or above (Ellis; Bradley, 1996: p. 446). Place traps near the plants, preferably 25 cm away from the plant to ensure that the leaves will not stick to the board. Alternatively, the traps can be hung and positioned at 60-75 cm zone above the plants.
- Grow seedlings under the fine mesh nylon nets. Crop infestations can begin through infested transplants (Ellis; Bradley, 1996: p. 484).