What Are the Methods for Determining Herbicide Damage in Rice

Currently, most people mix pesticides when using them in order to increase their effectiveness. However, if used improperly, this can easily cause herbicide damage. How to determine whether it is herbicide damage through investigation and analysis? The following methods are introduced:

1. Judge from the timing and amount of pesticide application: If the pesticide is applied to control pests and diseases 1 to 2 days after rice transplanting (seedling throwing), the rice is more sensitive and prone to herbicide damage. Applying individual pesticide products at high doses can also easily cause herbicide damage.

2. Check fertilizer and water, and soil conditions: After pesticide application, flooding too deeply (submerging the growing point) can easily cause herbicide damage. Check whether improper fertilization, application of undecomposed organic fertilizer, or improper retting of straw green manure in the field has caused poor growth symptoms in the plants.

3. Check pest and disease conditions: Rice plants damaged by rice thrips and rice root leaf beetles become shortened and clustered, with the leaf tips partially rolled into tubes and turning withered yellow, and the fibrous roots short and small. The symptoms of common rice dwarf disease are mainly leaf yellowing and withered curling, plant stunting, fading starting from the top leaf tips, and the appearance of fragmented spots, but the leaf veins remain green, and the leaves often show obvious alternating yellow-green stripes. These situations must be distinguished from herbicide damage.

4. Observe the growth of the seedlings before and after pesticide application: After normal green recovery following rice transplanting (seedling throwing), if abnormal symptoms occur after pesticide application, while the seedlings of the same seedling quality and same variety in adjacent fields grow normally, this may be herbicide damage.