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From the time of emergence of corn to 6 leaf stage (visible leaf 9 leaves), it is the period of leaf age of susceptible shrubs. In this stage, the disease will be acquired, and the smaller the age of poisonous leaves, the more severe the disease and the greater the loss. Compared with rice stripe disease transmitted by Laodelphax striatellus, the method of controlling SBPH in the crop growing stage is not applicable to corn, because once the corn is infected, the plant has almost no self-compensation ability, and the whole disease is a single disease. Lost. Production should generally adopt measures to adjust the sowing period of corn so as to avoid diseases. Summer corn is postponed until 10-15 days after the wheat harvest (about June 15), so that the susceptible period of corn and the peak period of poisoning of Laodelphax striatellus ( The end of May to mid-June is staggered.
Postponed planting of summer corn to avoid the peak of migration of Laodelphax
Maize is one of the hosts of SBPH. Poisonous fly hoppers cause maize rough dwarf disease after they are fed on corn seedlings. Dwarf maize rough-stemmed plants have short and thick bases, shortened internodes, and obvious dwarfs. The plant height is only one-third to one-half of the strong plant; the leaves are dark green, broad and short hard, and the main and lateral veins of the dorsi Wax white protrusions appear; roots are undeveloped and easy to pull up. Serious disease can not heading, and some heading but not solid, seriously affecting yield.