What is the best specific pesticide for rice bacterial leaf blight

Rice bacterial leaf blight is a major disease of rice, and its occurrence greatly affects rice yield. What are the specific pesticides for rice bacterial leaf blight?

1. Specific pesticides for rice bacterial leaf blight

For rice bacterial leaf blight, specific pesticides such as zinc thiazole, benzisothiazolinone, thiodiazole-copper, basic copper sulfate, streptomycin, bismerthiazol, thiosen copper, copper succinate-glutarate, zhongshengmycin, and octylamine acetate can be used.

Apply pesticides immediately for control once disease centers appear in the paddy field. In areas prone to the disease year after year, apply pesticides promptly for control after typhoons and heavy rain.

2. What is rice bacterial leaf blight

Rice bacterial leaf blight is a bacterial disease, and the pathogen is Xanthomonas oryzae pv. oryzae. The pathogen mainly damages leaves, and the symptoms include the leaf margin type, acute type, wilt type, midrib type, yellowing type, and many other types.

The leaf margin type is the most common. At first, dark green short linear spots appear at the leaf margin or leaf tip, and later grayish-white long streaks extend upward and downward along both sides of the leaf margin or the midrib, with fairly obvious irregular wavy lines at the edges.

In the acute type, diseased leaves are bluish gray or dark green, lose water rapidly, curl inward, and appear as green wilt, generally limited to the upper leaves and not spreading to the whole plant.

The wilt type, also called the dead-heart type, begins with the young leaf losing water and turning green-wilted, then gradually turning yellow-wilted and withering, while the other leaves remain green.

In the midrib type, the middle part of the leaf midrib first shows pale yellow streaks, which later expand into long withered-yellow streaks extending up to the leaf tip and down to the leaf sheath. In the yellowing type, the young leaf does not die at the early stage of disease; only irregular chlorotic spots are visible, which later expand into large withered-yellow lesions, and dark green small streaks sometimes appear at the base of diseased leaves.

When the air is humid, honey-yellow sticky ooze can be seen exuding from bacterial leaf blight lesions before the morning dew dries; this is called “bacterial ooze” and contains large numbers of bacteria. After drying, it becomes yellow-white fish-roe-like small particles attached to the rice leaves. If this phenomenon can be found during field inspection, it can be confirmed as bacterial leaf blight. Rice bacterial leaf blight tends to become epidemic when the temperature is 25-30°C, the relative air humidity is above 85%, the weather is rainy, sunshine is insufficient, and strong winds blow frequently.

Only by carrying out control measures well can bacteria be left with nowhere to invade, and at the same time paddy field management should also be done well so that the plants have better disease resistance.