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The bacteria causing the disease X. oryzae pv.oryzicola occur as rods. They are 1.2 x 0.3-0.5 µm in dimension. They are single, occasionally in pairs but not in chains. The bacteria have no spores and no capsules. They move with the aid of a single polar flagellum. They are Gram-negative and aerobic and can grow favourably at 28 °C. The bacterial colonies on nutrient agar are pale yellow, circular, smooth, convex, and viscid and have an entire margin. Their growth on slant is filiform. Growth
30
Jul

Rice root-knot nematode

 

Scientific name : Meloidogyne graminicola.

 Local name :

Damage of Rice root-knot nematode:

1. Nematode damages seedlings in nursery and in upland rice.

2. Larvae enter the roots and cause gall formation which disturbs the uptake of water and nutrients.

3. Infested plants show stunting

30
Jul

Symptoms of Bacterial Leaf Streak of Rice

• Initially, small, dark-green and water-soaked streaks on interveins from tillering to booting stage. • Streaks dark-green at first and later enlarge to become yellowish gray and translucent. • Numerous small yellow beads of bacterial exudates on surface of lesions on humid conditions. • Very small yellow beads instead of bacterial exudates during dry season. • Lesions turn brown to gre
30
Jul

Ufra nematode

 

Scientific name : Ditylenchus angustus.

Local name :

Damage of Ufra nematode:

1. Chlorotic streaks are noticed on the upper leaves, 2-3 month after planting.

2. Yellowing and mottling of the leaves with contorted margin, blackening of internodes, crinkled ear head with sterile spikelet and sometimes 3-4 ear h

30
Jul

Economic importance of Bacterial Leaf Streak of Rice

1. Under favourable weather conditions particularly typhoons and rain storms, the disease spread through entire fields, all the upper leaves become infected and turn brown resulting in heavy damage. 2. Losses as high as 32.3% in 1000-grain weight due to BLS were reported. At three disease intensities, the estimated yield losses were 8.3%, 13.5%, and 17.1% in the wet season and 1.5%, 5.9%, and 2.5% during the dry season.
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