The effects of low temperature storage on Bactrocera dorsalis(Hendel)in Nanfeng tangerines,and on tangerine sugar and acid content
[Aim]To determine the effect of low temperature storage on Bactrocera dorsalis(Hendel)eggs and larvae in Nanfeng tangerines,and on the soluble sugar and titratable acid levels of tangerines.[Methods]Tangerines that were infested with B.dorsalis eggs and larvae and non-infested tangerines were stored in a low temperature storage facility at 3 and 5 ℃,after which the mortality rate of B.dorsalis,and the soluble sugar and titratable acid levels of the tangerines were measured after different storage durations.[Results]2nd and 3rd instar larvae of B.dorsalis were more resistant to storage at 3 or 5 ℃ than eggs or 1st instar larvae.Mortality of eggs and larvae increased with storage time.At 3 ℃,tangerines had to be stored for 2.37-3.15 days to kill 50％of eggs and larvae,and for 11 days to achieve 100％mortality.At 5 ℃,tangerines had to be stored for 3.07-3.87 days to achieve 50％mortality,and for 13 days to achieve 100％mortality.Over time,the weight loss and soluble sugar content of non-infested tangerines increased,but the titratable acid content declined.After storage at 3 or 5 ℃ for 13 days tangerines had no signs of frost bite,high soluble sugar content(16.65％at 3 ℃ and 17.03％at 5 ℃),but low titratable acid content(1.18％at 3 ℃ and 1.16％at 5 ℃).[Conclusion]Storing Nanfeng tangerines at 3 and 5 ℃ for 13 days killed 100％of B.dorsalis eggs and larvae without adversely affecting fruit quality.
Bactrocera dorsaliscold treatmentNanfeng tangerinefruit qualitystorage time
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