||Postharvest treatments for control of Conotrachelus dimidiatus (Coleoptera: Curculionidae) in guava.
||Vargas-Madríz, H.; Martínez-Damián, M. T.; Mena-Nevárez, G.
||番石榴是拉丁美洲常見栽培的果樹之一；但是，其產量與果實品質皆因受到各種害蟲的危害而受限，其中包含了番石榴象鼻蟲（guava weevil），鞘翅目：象甲科（Conotrachelus dimidiatus）。這項研究評估了番石榴以溫湯與溫度貯存之採後處理後，其果實的理化變化。在溫湯處理70分鐘後，幼蟲即表現出死亡率，而在溫度處理中則是到第六天才觀察到幼蟲的死亡率。在兩種採後處理中，可滴定的理化酸度與維生素C變量在處理過程中均無呈現顯著的差異；而白利糖度和離子酸度相對於對照組則表現出顯著的差異。對於溫湯處理，建議減少浸泡時間，以最小化或避免影響測試處理的結果。對於溫度處理，已觀察到水果中番石榴象鼻蟲（C. dimidiatus）幼蟲的存在是導致糖含量降低的主因。因此，需要更多的研究來訂定理想溫度，讓處理過程對番石榴果實理化特性的影響降到最低。這些可以被認為是採後對該昆蟲進行控制的替代方法
||Guava is one of the most common fruit trees cultivated in Latin America;however, its production is delimited by different insect pests that affect fruit quality, including the guava weevil Conotrachelus dimidiatus. This study assessed the effects of two post-harvest treatment (hydrothermal and temperature storage) in the control of, as well as physicochemical variables of treated guava fruits. The hydrothermal treatment presented mortality of larvae 70 minutes after immersion, while mortality of larvae was observed after the six days of evaluation in the temperature treatment. In both post-harvest treatments, the variables titratable physicochemical acidity and vitamin C did not present significant statistical differences among treatments; whereas, the degrees Brix and ionic acidity showed significant differences with respect to the control. For the hydrothermal treatment, a decrease in the time of immersion is suggested in order to minimize or avoid the effects of the treatment tested. Regarding temperature, it was observed that the presence of larvae of C. dimidiatus in fruit leads to a reduction in the sugar content. Hence, more studies are needed to determine ideal temperatures in which the effects of the treatments are minimal or void on the physicochemical properties of guava fruit. These may be considered as an alternative to post-harvest control for this insect.
||Revista Colombiana de Entomología, v43