Control of Purple sheath Disease in growing Rice

After heading, the flag leaf sheath produced dense needle-tip-sized purple dots on the flag leaf sheath, and then gradually extended to most of the leaf sheath or the whole leaf sheath turned purple-brown, especially the outer wall of the leaf sheath, sometimes infecting the inner wall or deep into the stem. The seriously affected flag leaves died 7-10 days earlier. Sometimes it extends to the second to third leaf sheath, but the leaves do not die. When the humidity is high, the disease part appears white powder, that is, the conidiophores and conidia of the pathogen. The grain infection produced brown lesions or brown spots, and the 1000-grain weight decreased. It is considered that this symptom is the purple sheath type of rice leaf sheath rot after heading.

Pathogen Sarocladium sinense Chen, Zhang et Fu. It is called Clostridium sinensis, which belongs to the subphylum fungus. The morphological characteristics are similar to those of S.oryzae. It is considered that this disease and leaf sheath rot disease (S.oryzae) are the same pathogen.

The route of transmission, disease conditions and control methods see rice leaf sheath rot. When controlling purple sheath disease, 1500 times of 50% carbendazim wettable powder should be sprayed when 6% of rice is heading. In addition, 50% carbendazim 60g, 5% Jinggangmycin 80ml can be selected per 667m2, and the control effect of 65-70L water mixed spraying is more than 80%.