Pest control of licorice: leaf beetle pest control

Diorhabdar salis, Pynrrhalta enescens, Monolepta chinensis data, Diorhabdar bakowi, Ceytra sp., Colasposomadauricum, Coptocephalaasiatica, Basilepta fulvipes, etc., because the adults and larvae of leaf beetle eat licorice leaves, they do great harm. The leaves of licorice are often lost in damaged fields.

Firefly beetle is a major pest of licorice at present. It occurs three generations a year in northwest China, overwintering as adults, and begins to move in the next year when the average temperature is 10~15℃. Larvae total 4 instars, nibbling licorice leaves. Adults and larvae overlap, and only stems and veins remain when the damage is serious. The artificially planted licorice will die in the first year or the second year of damage.

Control methods: When the insect population density is relatively high (overwintering insects) in May and June, spraying should be done once in time, and 3% of Dimefon powder and 2.5% of trichlorfon powder can be used for control, and about 2.5kg per mu should be used. It can also be controlled with deltamethrin 3000~5000 times at the peak of occurrence. Before overwintering, it can be treated by clearing residual branches and leaves before winter and irrigating in winter to reduce the survival rate of overwintering.

(3)The control of licorice seed pests mainly include licorice bean weevil (Bruchidius ptilinoides), licorice seed wasp (Bruchophagus glycidae), etc., which can cause greater damage, the former mainly in storage period, the latter mainly in the field damage.

The licorice bean weevil has one generation a year, overwinters as larvae in licorice seeds, and begins to emerge in late May. Most of them fed on seeds of licorice in storage period, adults also fed on leaves of licorice. The rate of damaged seeds reached more than 35% after overwintering and 77.4% after storage for two years.

Control methods should focus on pod bearing stage and licorice seed pod harvest after separation storage period for control.