PATHOLOGICAL

Hi everybody.How are you? I think you are not well at all.Are you feeling tension about your  disease infested rice  field?Feel no tension . Because an agriculturist is in front of you.

There are some important disease in rice .One of them is brown spot.Brown spot was one of the principle cause of the Bengal famineof 1943 in India.Estimates shows that two million people died of starvation.Typical symptom of the disease on the leaves are small, circular, dark brown or purplish dots.Most spots have a light yellow halo around their margins.Burning of crop residues and spray of fungicideat heading and grain maturation may be the control measure of the disease.

If  fully developed lesions are spindle or eye shaped on leaves of your rice field then it is blast disease. It may  occur in panicle and node region also.cultivation of resistance varieties; seed treatment with DithaneM-45,Topsin M, Benlate and Homai at seedling stage  and booting stage use as fungicide are the effective control measure of the disease.

Normally visible another disease is foot rot and bakane. The diseased plants are much taller with lanky tillers.Adventitious roots develop from first, second and third nodes above the ground level.The disease may be controlled by uprooting and destroying of diseased tillers.Seed treatment with DithaneM-45,Vitavex-200,TopsinM,Benlate and Homai can give good control.

Next is sheath blight.The first symptom are grayish-green lesion with brown irregular margin.Foliar spray with 0.5% carbendazim(Bavistin), or 0.5% editenphos or 0.5% Vitavex twice at intervals of 10-15 days after the first appearance of disease can give good control.

False smut or locally known as ‘Laxmir gu’is another important disease.Symptoms are seen only in maturing panicles.Affected  grains are transformed into  masses of spores that are greenish outside and yellowish orange inside.Copper oxychloride reduced  false smut effectively.

Bacterial Leaf Blight (BLB) is the most serious disease of rice in our country.Longitudinal  yellow to white water-soaked lesion at the margins of infected leaves is the symptom of the disease.To reduce the disease,1-2 spraying with murcery compounds or antibiotic solutions should be applied at the late nursery stage.

Ufra is important disease in low lying areas.Ufra is classified on extent of panicle emergence as Ufra-l, where panicle fails to emerge;Ufra-ll,partial emergence;Ufra-lll, complete emergence but most of the grains are infilled.Spreading of furadan 5G is an effective control measure of the disease.

Tungro is a viral disease.Stunted growth ,reducing of tiller number and yellowing of leaves are the symptoms of the disease.Cultivation of resistant variety is the control of the disease.

Yellowing of young and newly  emerged  leaves ,stunted growth and profuse tillering are the symptoms of yellow dwarf disease.Insect control and cultivation of resistant varieties are the only measures generally adopted for controlling the disease.