What are the causes of tungro rice?
What are the causes of tungro rice?
Rice tungro disease is caused by the combination of two viruses, which are transmitted by leafhoppers. It causes leaf discoloration, stunted growth, reduced tiller numbers and sterile or partly filled grains. Tungro infects cultivated rice, some wild rice relatives and other grassy weeds commonly found in rice paddies.
How do you treat tungro rice?
The top 10 cm portion of the leaf is immersed in a solution containing 2 g of iodine and 6 g of potassium iodide in 100 ml of water for 15 minutes or 10 ml of tincture of iodine + 140 ml of water for one hour. Washed in water and when examined. Tungro infected leaves develop dark blue streaks.
Which rice tungro virus is responsible for induction of Majority of symptoms?
In rice tungro, RTBV induces most of the symptoms (yellowing and reddening of the leaves, stunting of rice plants) and RTSV is mainly involved in the transmission of both viruses via the green leafhopper Nephotettix virescens (5).
Which is the resistant variety for rice tungro disease?
Tukad Petanu and Kalimas are considered as resistant variety based on the disease index, and can be recommended for tungro endemic area in rotation with other varieties. Utri Merah is a good source of resistant genes for breeding new tungro resistant varieties.
What is rice disease?
Other well known rice diseases are sporadic, localized or minor in the state. They include stem rot, black sheath rot, scald, scab, aggregate sheath spot, bordered sheath spot, leaf smut, brown spot and narrow brown spot among others.
What is Khaira disease of rice?
Until very recently zinc deficiency of the rice plant had not been shown to occur in the field. Y. L. NENE (1) was the first to show that a foliar application of zinc sulfate corrects a disorder of the rice plant long known as Khaira disease in North-Central India.
What are the symptoms of Tungro?
Symptoms of tungro include orange yellow coloring of leaves, stunting, reduction in tiller number, and poor panicle emergence. Tungro affects some rice cultivars in all stages of growth; early infection reduces green matter and causes yield losses up to 68% (2).
What are the five common diseases of rice?
They include stem rot, black sheath rot, scald, scab, aggregate sheath spot, bordered sheath spot, leaf smut, brown spot and narrow brown spot among others. In rare instances, any of these diseases have the potential to cause yield loss under ideal circumstances.
How do you control Khaira disease of rice?
Treatment of rice seed with 0.4% ZnSO4 before sowing or of seedlings before transplanting gives control. Spraying with 0.4% ZnSO4+2% urea on the appearance of the symptoms is useful.
Who discovered Khaira disease of rice?
During his 14-year tenure at Pantnagar, Nene’s work on “Khaira Disease of Paddy” was recognized internationally because the cause of disease was established to be zinc deficiency in field rice, which was the first such report in the world.
What are the symptoms of the Rice tungro virus?
The disease is caused by rice tungro virus (RTV), which is transmitted by the green leafhopper, Nephotettix virescens. Symptoms of tungro include orange yellow coloring of leaves, stunting, reduction in tiller number, and poor panicle emergence.
Can a rice plant have both tungro and RTBV?
This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License . Full symptoms occur if both rice tungro spherical virus (RTSV) and rice tungo bacilliform virus (RTBV) are present. RTSV enhances the tungro symptoms produced by RTBV. These symptoms vary in rice plants ( Oryza sativa ) of differing ages.
What kind of disease is found in rice?
Causal Organism: Rice Tungro Bacilliform Virus (RTBV) and Rice Tungro Spherical Virus (RTSV) Penyakitmerah which has been known in Malaysia since 1938 was identified as Tungro in 1965. The mentak disease of Indonesia is also identified as Tungro. Tungro is commonly found in Bangladesh and India.
What are the symptoms of a tungro plant?
Tungro-infected plants also show symptoms of stunting, delayed flowering which may delay maturity, reduced number of tillers, small and not completely exserted panicles, as well as a higher than normal percentage of sterile panicles or partially filled grains, covered with dark brown blotches.