Method for evaluating rice planthopper-resistant property of rice

Abstract

The invention provides a method for evaluating the rice planthopper-resistant property of rice. The method includes the steps that: (1) a nylon net greenhouse is constructed; (2) rice varieties, which include a rice variety to be tested, a pest-resistant check variety and a pest-susceptible variety, are planted in the greenhouse; and the pest-susceptible variety is planted around each variety to serve as rice planthopper-inducing rows; (3) the dosage of nitrogenous fertilizer is 200kg / ha to 250kg / ha; (4) at the early tillering stage of all the varieties, 2.5 percent of deltamethrin emulsifiable concentrate or 20 percent of triazophos emulsifiable concentrate is used for killing all pests and natural enemies in the net; (5) 10 days after the step 4, adult rice planthoppers are put on the pest-susceptible check variety (TN1) planted around the rice variety to be tested, 5 to 10 pairs per clump, and are freely and naturally propagated and randomly transferred to the variety to be tested; (6) after the step 5, when all of the pest-susceptible check variety in the test field dies, the resistance of each variety is evaluated, wherein the rice variety to be tested has high resistance when the death rate of the rice variety to be tested is less than 10 percent, pest resistance when the death rate is 11 percent to 30 percent, medium resistance when the death rate is 31 percent to 50 percent, medium susceptibility when the death rate is 51 percent to 70 percent, and pest susceptibility when the death rate is higher than 70 percent. The method has the advantages of simplicity and high operability, and accords with production reality.

Description

technical field [0001] The invention relates to the field of pest control and provides a method for identifying the resistance of rice varieties to rice planthoppers and other pests in the field. Background technique [0002] The main pests of the planthopper family Delphacidae in the rice field ecosystem are the brown planthopper Nilaparvatalugens, the white-backed planthopper Sogatella furcifera and the white-backed planthopper Laodelphax striatellus. Rice planthoppers directly suck the phloem sap of rice plants, resulting in slow growth, delayed tillering and increased shriveled grains of rice. When the damage is serious, the rice plant will die, showing the shape of "lice burning". In addition to direct damage, it can also spread viral diseases such as black-streaked dwarf, southern black-streaked dwarf and stripe leaf blight, causing serious harm. Alternate or simultaneous outbreaks of three planthoppers have become the most important limiting factor affecting rice pr...

AI Technical Summary

Problems solved by technology

Moreover, these evaluations are all carried out in greenhouses or cement tanks, and there is a large gap between the evaluation environment and the field, which often leads to a certain deviation between the identified resistance level and the actual resistance performance in the field.

However, under natural conditions, complete field resistance identification is also vulnerable to natural disasters such as rice planthopper invasive populations and non-target pests, with large year-to-year variability

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