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在田間隔离昆虫传染的条件,于小米不同生长期所进行的人工分期接种試驗,証明接种期愈早对植株的生长和产量的影响愈大,并发現根系受紅叶病毒的影响最为显著。在田间条件下不同播种期对小米感染红叶病的百分率的影响不大一致,但根据两年的結果,早播一般均较正常播种期的发病率为高。人工飼育蚜虫的試驗,未发現玉米蚜能在鵝冠草等11种多年生禾本科杂草上越冬。在所測定的11种植物中,小米紅叶病病毒能在黍草(Panicum virgatum L.)和垂穗草(Bouteloua curitipendula(Michx.)Torr.)上越冬。三年的試驗証明,田间不同时期噴射內吸杀虫药剂虽可減少蚜虫数量,但对小米产量和紅叶病发病率均无显著影响。对二百多个小米品系連續四年进行紅叶病抗病性的鑑定,发現大多数品种都是高度感病的,沒有抗病和免疫的品种,但有許多高度耐病的品系。选出耐病而且农艺性状良好的P14A、NP—157、P354和摩里等四个品系。
Isolation of insects in the field isolation conditions, in different phases of millet artificial staging inoculation test to prove that the earlier the inoculation period on the plant growth and yield greater impact and found that the root system is most affected by the mosaic virus. The effects of different sowing dates on the percentage of millet-infected leafmines were not the same in field conditions, but the early-sowing rates were generally higher than those of normal sowing dates according to the two-year results. Artificial reared aphids test, did not find the corn aphids in the goose grass 11 perennial weeds overwintering. Among the 11 tested plants, the millet mosaic virus (CMV) can winters over the Panicum virgatum L. and Bouteloua curitipendula (Michx.) Torr. Three years of trials have shown that spore insecticide injections at different times can reduce the number of aphids, but have no significant effect on the yield of millet and the incidence of leaf disease. Over 200 millet lines were tested for resistance to leaf blight for four consecutive years and found that most of the varieties were highly susceptible. There were no resistant or immunized varieties, but many highly resistant lines. The four lines P14A, NP-157, P354 and Mori were selected to be disease-resistant and agronomic.