(1) The pineapple fruit is sprayed with the compound polysaccharide preserving agent, and after drying, the baskets are piled at room temperature, which can effectively control black rot, and have certain control effects on black heart disease. In the storage period of 20 to 30 days, the control effect can be as high as 85%. The fruit of the leftover buds was treated with preservatives, and the incidence of black heart disease was much lower than that of those who did not stay. (2) Immerse the stem in a solution of 2.7 kg of biphenol and 378.5 kg of water. Store it in a well-ventilated container or pack it in a polyethylene bag. The relative humidity is about 90%. Store for more than 15 days. The suitable conditions for refrigeration are: temperature of 8 to 10°C and relative humidity of 90% to 95%. (3) The pineapple fruit is sprayed with a solution containing 250 ppm acetic acid and 250 ppm 2,4-D to inhibit the black heart disease to a certain extent. (4) The timely harvested pineapple is pre-cooled and heat-dissipated, wrapped with 1% diphenylamine or coated with 2.5% sodium propionate or coated with 1% sorbic acid aqueous solution, and placed in a fruit basket. Under storage conditions (temperature 7 ~ 10 °C, relative humidity 85% ~ 90%). This storage is still edible for more than a month. Excerpt from: "Guoshu storage preservation processing Daquan"
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