Upward?

This upward Curl is due to insect feeding.

These insects are called “thrips”.

Look the moving thrips in this vedio.

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Don't worry. You can adopt the following methods to manage the thrips. There are two ways to manage thrips

First is, you have to spray chemicals, either Imidacloprid or Reagent @5ml/lit with a freqency of once in 5 days, if the leaf curl is clearing dont spray the chemical.But these chemicals are hazardous to other organisms too. So I suggest another methods other than chemicals

* Here are the Steps for the Preparation of the Bio-pesticides


 * 1) Take cow urine + cow dung in 3:1 ratio
 * 2) This mixture should be kept for 2 months in a container with open mouth
 * 3) You can spray this mixture diluting five times with water

If you adopt some simple agronomic practices then you can minimise the infection in your field.