Maize infestated with caterpillar

If this is the case in most or nearly half of your field then you can look into chemical applications which someone experienced will surely guide you. Otherwise you can use 5 ml per liter neem oil with water and spray the field to save healthy plants from getting attacked. NPV is also an organic option.

Yes my maize are infected fall army warm

Spray quinalphos along with cypermethrin

Hi Shriprasad Pawar . Send your maize plant pictures.

Shriprasad Pawar फाल आर्मी वर्म की पूर्ण जानकारी एवम् रोकथाम के लिए निम्न वीडियो देखे https://youtu.be/wW2cK74CoDk