Doses de fosfito de potássio sobre a antracnose e a qualidade do mamão.

Abstract

Anthracnose is considered the most important disease in papaya postharvest and occurs in all producing countries. Although it occurs in fruits at any stage of development, presents with greater frequency in mature. This study aimed to evaluate the effect of potassium phosphite doses /rl v/fro and /rl v/vo control of the causal agent of anthracnose as well as the effects of the product as in papaya. The experiment was conducted in the Laboratory of Plant Pathology and Agricultural Products Technology Center of Science and Technology Agrifood (CCTA) at the Federal University of Campina Grande (UFCG), campus of Pombal-PB. The /rl v/fro and /n v/vo using a completely randomized design, which first had 7 treatments (doses 0, 0.2. 0.4, 1, 2, 4 and 8 ml L'l) and 6 repetitions, totaling 42 experimental units which assessed the inhibition of mycelial growth of Co//efofrfchum sp, was later made the /r7 v/L'o test that evaluated the effect of phosphite on anthracnose and quality tests individually with 5 treatments (doses 0; 1, 2, 4:and 8 ml L'l) and 8 repetitions, totaling 40 experimental units for each experiment. In /n v/fro tests, the servings of potassium phosphite (1 , 2, 4 and 8 ml.L'l) afforded inhibition of mycelial growth of Co//efofrfchum sp, on the order of 52,98.l 67,841 59,56 and 69,01%, respectively. /n v/vo test, after 8 days of incubation. only doses 4 and 8 ml.L'' have led reduction in lesion área caused by Co//efofr7cht/m sp. in fruits of papaya. The application of potassium phosphite in the doses used in this study did not affect the external appearance characteristics and titratable acidity in papaya fruits 'Golden'.