Which chemical agents give good control results against pineapple heart rot?
This disease mainly affects seedlings, but can also affect mature plants. In affected plants, the leaves are still greenish at first, with only a slightly darker, lusterless leaf color, and the central leaves are yellowish white. After that, the leaf color gradually turns yellow or reddish yellow, the leaf tips dry up, and a water-soaked rotting surface develops at the leaf bases. The most important feature of this disease is that the central leaves can be pulled out easily....
This disease mainly affects seedlings, but can also affect mature plants. In affected plants, the leaves are still greenish at first, with only a slightly darker, lusterless leaf color, and the central leaves are yellowish white. After that, the leaf color gradually turns yellow or reddish yellow, the leaf tips dry up, and a water-soaked rotting surface develops at the leaf bases. The most important feature of this disease is that the central leaves can be pulled out easily.
Control method: when planting, the seedlings should be set out only after the wounds have dried; the seedling bases can be soaked for 10 to 15 minutes in a 25% carbendazim 800-1000 times dilution, then dried before planting. For affected orchards, spray a 25% carbendazim 1000-1500 times dilution or a 70% thiophanate-methyl 1000-1500 times dilution.