Dear Sri Vamsi, Upto my knowledge, moringa oleifera ( drum stick ) plants have insect problems, but not have any notable diseases. Insects like caterpillars and bud/pod worms etc creates considerable damage, if neglected.
Each plant requires atleast 15 to 20 kgs of FYM at the time of planting and twice more during cropping. like same, inorganic NPK also is to be given initially and also during cropping.
Basing on photos shown by you, i think only some plants are like skelton. Approximately what is the percentage. if it is only 2 or 3 percent, i opine that it is negligible. pl forget. if it is like considerable, say 10 percent plants, pl show your farm to some officials of horticulture Asst directors level offficers, and follow their instructions.
Along with required Inorganic fertilisers, pl give possible organic fertilisers , during cropping period.
All the best to you. g.p.rao, farmer