Effects of Rehmannia glutinosa on the growth and development of Spodoptera litura
[Objective]Spodoptera litura significantly impacts cotton cultivation,while Rehmannia glutinosa is a prevalent agricultural weed.The exploration and application of R.glutinosa for controlling the S.litura hold crucial relevance for the sustainable production of cotton.[Methods]The effects of root or leaf dry powder of R.glutinosa on the mortality,developmental duration,and body weight of S.litura larvae were preliminarily determined by mixing the dry powder and feed with the mass ratios of 1∶3,1∶6,1∶9,and 1∶18,respectively.Additionally,the influence of 95％ethanol extracts of root or leaf powder of R.glutinosa(the ratios of dry powder to solvent were 1∶50,1∶30,and 1∶10)on the mortality of 1st to 6th instar S.litura larvae were studied by film-coating technique.[Results]The incorporation of R.glutinosa root or leaf dry powder into the larvae's diet notably affected their growth and development.An increase of the root or leaf dry power content in the diet led to higher larval mortality,extended developmental periods,and decreased body weight.The most significant inhibitory effect occurred when the mass ratio of root or leaf dry powder to feed was 1∶3.The ethanol extracts of R.glutinosa root or leaf exhibited a certain inhibitory effect on the younger larvae,while with diminished efficacy on older larvae.As the concentration of R.glutinosa extract increased,the mortality of younger larvae increased at the same testing period.Optimal toxicological effects on 1st to 6th instar larvae were observed when the root or leaf dry power of R.glutinosa to solvent ratio was 1∶10.[Conclusion]R.glutinosa shows a definitive inhibitory effect on S.litura.In a certain range,the greater dosage of R.glutinosa root or leaf dry powder has the stronger inhibitory effect.This finding lays a theoretical groundwork for the strategic utilization of agricultural weed resources in developing plant-derived insecticides.
Spodoptera lituraRehmannia glutinosagrowth and developmentmortalitydry powderextract
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