RICE RATOONING - IRRI books - International Rice Research Institute

DISEASE MANAGEMENT IN RATOON RICE 217SUMMARY1. If rice cultivars possessed resistance to certain rice diseases, the level or degree ofresistance also showed in the ratoon crop.2. If the main crop has systemic disease infection, the stubble was unlikely toproduce any ratoon tillers; if the infection was late, with diseases such as tungro,ratoon tillers may develop but subsequently succumb to the disease.3. Yellow dwarf, a disease caused by a mycoplasma-like organism, was oftenobserved in ratoon crops, probably because of its long latency in rice plants.4. Diseases such as sheath blight and stem rot were observed not only on the maincrop, but also on the ratoon crop. Their effect on ratooning was erratic.5. It appears to be more effective for ratoon production to manage diseases likesheath blight and stem rot in the main crop rather than in the ratoon crop.6. Individual ratoon tillers may be prone to lodge or die as a result of diseases such assheath blight and stem rot in the main crop.REFERENCES CITED1. International rice Research Institute. 1980. Standard evaluation system for rice. 2d ed. P.O. Box 933,Manila, Philippines. 44 p.2 Ling, K.C., E.R. Tiongco, V.M. Aguiero, and P.Q. Cabauatan. 1978. Rice ragged stunt disease in thePhilippines. Philipp. Phytopathol. 14:38-57.3. Ooi, P.A.C. 1980. A survey of rice ragged stunt in ratoon rice plants in the MUDA Irrigation Scheme,Malaysia. Malays. Agric. J. 52(4):56-60.4. Ou, S.H. 1985. Rice diseases. 2d ed. Commonwealth Mycology Institute. Commonwealth AgriculturalBureaux, England. 380 p.6. Plucknett, D.L., J.P. Evenson, and W.G. Sanford. 1970. Ratoon cropping. Adv. Agron. 22:285-330.