Protection by screen…

I have been planting Pechay and have grown them healthy for a month then suddenly I scraped out the whole plant. Then the cycle keeps on repeating. This is because the leaves were attacked and eaten by the “unknown”. Until now, I really don’t know what insects were eating my Pechays’ leaves. Is it the worm, rat or bird?

Since I still can’t figure out because I didn’t catch them in the act, I bought a wire screen. The screen serves two purposes, protection against the “unknown” and strong direct sunlight. I think my Pechays are happy now :).