Survey methods for major diseases in rice

rice blast

1. Miao Wei and Ye Yu. Investigate the incidence of field plots and see the type of lesions targeted for field control. At the seedling stage of Sakata and Honda, the fields of susceptibility to disease, green-growing fields, cold-water immersed fields, and cold-water irrigated fields in the mountains were selected as the key investigation fields. A parallel line jump sample was used. Each hill was inspected with 100 feet and checked once every 5 days. When there was a disease center, a general survey was conducted. All fields with acute lesions or episodic centers should be treated as field objects. After an acute type of lesion or episode has been found, if the weather forecast is hot and rainy and the fog is exposed, the protection should be sprayed immediately.

2, spikes and necks. After drawing from the flag leaves, check the color change of leafhoppers and leaf pillows, and look at the weather to determine the target field. The survey method was the same as Ye Ye. Leaf and flag leaf lesions, especially those with acute lesions, should be classified as field objects for prevention and control. Early and late rice headings should be exposed to low temperatures and rain at the heading stage, and also to fields susceptible to cultivars and late-maturing crops. Should be classified as a field for prevention and control. It is a dangerous growth period of rice susceptible to disease from the heading of rice to the time of breakage to the milking stage. In the investigation of pests and diseases, it is necessary to grasp the growth period of rice. The prevention and treatment of panicle blast should be carried out during the rice break period and heading period.

Rice sheath blight

You can use methods that combine Dingtian surveys with Daejeon census. The Dingtian survey selected a variety of headhunters, each from the head of the rice industry, and began investigating once every five days from the rice tiller period. Each field is divided into three points: south, middle and north. Each site surveys 20 miles, totaling 60 miles. Field records the beginning period and the number of sicknesses and calculates the disease rate. When the field survey begins with cheek disease, and the condition rises quickly, a field survey should be conducted. Each field should be sampled in parallel with 20 points, 10 points per point, for a total of 100 cases, and the sickness rate should be calculated. When the disease rate reaches 30%, it should be treated with Jinggangmycin immediately.

The formula for calculating the sickness rate is: disease sickness rate (%) = number of sickness affected/total number of surveyed 100 rice bacterial blight

Early rice from the period of high tillering and late rice from the returning green stage, select susceptible field plots and planting sensitive field plots as fixed-point survey fields, and survey every 5 days or after the rain. During the survey, pay attention to Tanabe, Taguchi, intake, etc. ,Put open and check from the bottom of the blade, from bottom to top view one by one. When the onset center or the diseased plant is found, the onset field, seed-bearing field, and susceptibility species should be listed as the control object fields, and the Qiu block near the onset of the onset should also be listed as the control object field. When the examination shows the symptoms of the onset or sporadic disease, water-stained acute lesions, and the symptoms of heart and leaf bruising, it should be immediately prevented. After the illness, if there is a storm surge, it should be controlled again after the rain.

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