When plants are six weeks and then sprayed with a water-soluble Artemisia oil refinery. 2,4,6% (V / V) (use distilled water as a control).
Using a sprayer in the ratio of 100 ml / m2 Total 20 pots randomly 4-5 pots
1-7 days after spraying look chlorotic to necrotic skin pale and dead plants . Then measure the amount of damage from the porous of chlorophyll.