My paddy plants have whitish empty ear heads standing up straight, why?

Whitish empty ear heads that stand upright while the rest of the panicle stays green are a classic sign of white ear caused by stem borer damage at the panicle stage, where the larva bores into the stem and cuts off the food supply to the head. Before booting the same borer causes dead hearts in the central shoot, so look for a bored hole near the base and pull a white tiller to check for the tunnel and the caterpillar to confirm, or show a photo to your KVK or agri officer. Cultural steps that help are clipping and destroying the affected tillers, keeping bunds clean, and using pheromone traps and light traps to track the moths. If control is needed, common recommendations include actives such as cartap hydrochloride or chlorantraniliprole, but always follow the label dose, the pre-harvest interval and your local KVK advice, and rotate the mode of action so the borer does not develop resistance. White ears at this late stage are already lost, so the aim is to protect the remaining good tillers.