Arugala is frequently infested with insects and must be checked.
Look for aphids, thrips and mites.
How to check arugala
1. Remove the leaves from the stem.
2. Soak the leaves in a solution of vegetable wash and water. Enough vegetable wash should be used to make the solution feel slippery and sudsy. The solution should be in a vessel that is large enough to fit the product to be checked, and to allow an individual to vigorously agitate the product.
3. Agitate the product in the solution.
4. Remove the product from the solution. Direct a stream of water at each leaf, on both sides, and rub the leaves with your fingers during the process.
5. Fill a second vessel with clear water (without the vegetable wash). Place all of the product in it and allow it to soak for five minutes.
Note: If all of the product does not fit in the vessel at one time, keep repeating steps five-seven (fill with water, place product in, soak for five minutes, agitate, remove, pour, place over light box and check..), until all of the product has been soaked and checked.
6. Agitate the product in the solution. Remove the product from the water.
7. Pour some of the water into a glass vessel, such as a Pyrex vessel.
8. Place the glass vessel over a light box or in window light and check for infestation*.
9. Repeat steps 7 and 8 two more times—i.e., pour some water into a glass vessel and check it, then pour more water into a glass vessel and check it.
10. If any insects are found in any of the checkings—repeat steps 2-8.
*The method of checking which is advised here is based upon the fact that the infestation is not easily visible when it is on the leaves but is visible in the water.