Indução de resistência no manejo da fusariose e podridão negra do abacaxi

Abstract

Fusarium guttiforme and Thielaviopsis ethacethica are responsible for numerous losses regarding the cultivation of pineapple. Despite the fusarium be considered a pre-harvest disease, the damage to the fruit, negatively reflecton marketing; T. ethacethica already responsible for black rot of pineapple fruit is typically a disease of post-harvest, causing losses mainly fruit for both industry and the fresh market. Thus the two plant pathogens in question cover the entire production chain of the pineapple. Given the importance of these etiological agents and the high level soft infection in the producing regions of the fruit this study evaluated effect of alternative products in the management of fusarium wilt of pineapple and black pineapple rot, as well as checking the possible physical-chemical and biochemical changes they can cause the fruit. In the first article, the effect of alternative products in the management of fusarium wilt was analyzed in the pre-harvest by natural infection in the field, as well as lifting incidence of fusarium wilt of pineapple. In these article, the effect of alternative products in the management of black rot was analyzed in post-harvest checking its action on these verities of the lesions in the fruits and possible changes in mycelia growth and sporulation of T. ethacethica. The products tested were potassium phosphite (FK), calcium phosphite (FCA), copper phosphide (FCU), Agro-Mos (AGM), calcium silicate (CAS), Biopirol®, Bion® and carbendazim CCAB 500 SC applied at recommended dosages by manufacturers. For the analysis of natural infection by Fusarium results show edth at FK, FCU and Biopirol were efficient in controlling the incidence of the disease. The physico-chemical analysis show edth at the treatments did not promote change in the pH of the fruit, while in biochemistry only FK promoted the expression of β-1,3-glucanase enzyme in pineapple fruit. Related to T. ethacethica, the results show edth at Bion®, agro- and FK we were able to control black rot in the fruit. FK inhibited mycelia growth and sporulation of the pathogen. The applied products provided changes in pH levels, SST and ATT. Biochemical changes were not observed by the application of the products.