Red Mites | Plant Pests | Hydroponics farming in India

I have plenty of red mites that sometimes move under the leaves of ridgegourd. It has already destroyed my pumpkin plant. i tried to hose it down with water. But it is still there everytime i check. The leaves too are losing their lush green colour and becoming sort of off white .The horrible mites keep destroying all my creeper plants. now it is affecting my green beans too. pls help. thanks