Seed selection and seed treatment of licorice
Ural Glycyrrhiza uralensis with high content of glycyrrhizic acid and glycyrrhetinic acid was selected.
Seed treatment licorice seed coat is hard, impervious, impervious, not easy to germinate, untreated seed germination rate is only 30%-40%, while after skin-breaking treatment, the germination rate can reach more than 90%, so the seeds must be pretreated before sowing. The method adopted is as follows: soak the seeds in 60 ℃ water, cover them with wet cloth for 4 ~ 6 hours to absorb water and expand, dry and then sow.
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Licorice aphid
Harm young leaves, twigs, flowers and fruits. The sucking juice of adults and nymphs can make the leaves yellowing and fall off in severe cases, affecting fruiting and commercial yield. Control method: ① is not allowed to be planted next to legumes. During the onset of ②, 40% dimethoate EC was sprayed with 1000 times.
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Licorice rust and its control
① pathogen Glycyrrhiza uralensis rust pathogen (Uromycesglycyrrhizae) belongs to the genus → of the subphylum basidiomycetes, →, → rust, → Puccinidae. The regularity of ② is a. In the summer spore stage, at the seedling stage of Glycyrrhiza uralensis, a light brown summer spore pile appears at the tip of the leaf that has not yet spread. With the spreading and growing of the young leaves, the spore pile appeared densely along the leaf back from the leaf tip, and finally the whole leaf back was covered by the spore pile, showing a yellow color.
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