Control efficacies of several fungicides and mixed agents on lily bulb rot during storage period and their safety to lily
The quality of Lanzhou lily bulbs is affected by bulb rot during storage,which has a serious impact on the sowing and reproduction of lily.In order to prolong the safe storage time of lily bulbs and reduce the loss of bulbs during storage,eight kinds of fungicides single agents and five kinds of mixed agents were selected on the basis of previous experiments.The lily bulbs were soaked before storage,15 days and 30 days after storage.After drying,they were stored at 4℃.The occurrence of bulb rot was investigated before storage,15,30,45 and 60 days after storage,the control effect of each fungicide was calculated,and the safety of the fungicides on lily was observed after 60 days.The results showed that different fungicides had different control effect on bulb rot of Lilium davidii var.unicolor,and the control effect of each fungicide gradually increased with the prolongation of treatment time and the increase of treatment times,and the control effect reached the maximum at 60 days.The control efficacies of five fungicides single agent cuprous oxide 86.2％WP,oligosaccharins·plant activator protein 6％WP,Paenibacillus polymyxa 100 million cfu/g FG,iprodione 500 g/L SC and chlorothalonil 75％WP on bulb rot of Lilium davidii var.unicolor during storage were all above 70％,which were 71.13％,71.24％,75.36％,76.08％and 76.76％,respectively.The control efficacies of five kinds of mixed fungicides eugenol with Paenibacillus polymyxa(1∶9),cuprous oxide with iprodione(2∶8),Paenibacillus polymyxa with chlorothalonil(8∶2),cuprous oxide with chlorothalonil(5∶5),eugenol with chlorothalonil(4∶6)on lily bulb rot during storage were more than 76％,which were 76.38％,77.64％,79.92％,78.18％,80.79％,respectively.The control effects of two kinds of biological fungicide with chemical fungicide mixtures,and one kind of biological fungicides mixture on lily bulb rot during storage were higher than those of single agent,showing synergistic effect.Cuprous oxide with iprodione(2∶8)and cuprous oxide with chlorothalonil(5∶5)showed additive effect.The germination test and field planting test of lily bulb scales treated with chemical treatment for three times and stored for 60 days showed that the treatment could promote the growth of lily.The germination rate and the number of germination per scale of single agent 20％TraT2A AS and mixed agent eugenol with chlorothalonil(4∶6)were 86.67％,75.55％and 1.76,1.67,respectively,which were 69.57％,47.82％,64.07％and 55.77％higher than those of the control.The germination potential,germination rate,plant height and stem diameter of lily bulbs treated with Paenibacillus polymyxa 100 million cfu/g FG and 50％TraT2A WG were 73.33％,80.00％and 5.53 cm and 5.78 mm,respectively.The growth promotion rates were 83.33％,50.01％,13.32％and 68.02％,respectively.The germination potential,germination rate,plant height and stem diameter at seedling stage of the mixed agent eugenol with chlorothalonil(4∶6)were 80.00％,86.67％,8.24 cm and 7.23 mm,respectively,and the growth promotion rates were 100％,62.51％,68.85％and 99.42％,respectively.The findings of this study hold significant implications for the prevention and control of Lanzhou lily bulb disease during storage,as well as for enhancing the quality of lily seed ball.
fungicidemixturelily bulbstorage period diseasecontrol effectsecurity
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