@article{Oliveira_Blum_Duarte_Moreira_Luz_2016, place={Dracena, SP}, title={Variability of aggressiveness and virulence of Phytophthora palmivora influencing the severity of papaya fruit rot in postharvest in Bahia, Brazil}, volume={44}, url={https://cientifica.dracena.unesp.br/index.php/cientifica/article/view/667}, DOI={10.15361/1984-5529.2016v44n2p185-195}, abstractNote={<p>Papaya (<em>Carica papaya</em> L.) is susceptible to various production diseases, therefore, studies are needed to reduce them. Papaya fruit rot (<em>Phytophthora palmivora </em>(Butler) Butler) is one of the fungal diseases present in producing regions (Bahia and Espírito Santo) of Brazil. This study aimed to evaluate the variability of aggressiveness and virulence of <em>Phytophthora palmivora </em>that influence<em> </em>the severity of fruit rot in postharvest <em>in vitro</em> and <em>in vivo. </em>The following mycelial growth characteristics were evaluated: (a) mycelial growth speed index (MGSI); (b) mycelial growth speed potential (%MGSI); (c) spore production (SP); (d) spore production potential (%SP) and (e) growth potential (%GP) of 21 strains. The maximum mycelial growth after 120 hours of cultivation in strains of <em>P. palmivora </em>ranged between<em> </em>27 and 81 mm for strains 355 and 356, respectively. Strains 356, 363, 839, 1056, 1060 and 1189 showed the highest MGSI values. These strains have a high colonization speed and, therefore, good capacity to settle on the substrate. Among them, strains 356, 1060, 839 and 363 showed better %MGSI when compared with the other strains. The most virulent were: 356, 357, 358, 359, 361, 363, 839, 1055, 1056, 1057, 1060 and 1189, whereas the most aggressive were 356 and 1060.</p><p> </p><p><strong>Additional keywords: </strong>mycelial growth; spore production; fungal rot.</p>}, number={2}, journal={Científica}, author={Oliveira, Thiago Alves Santos de and Blum, Luiz Eduardo Bassay and Duarte, Elizabeth Amelia Alves and Moreira, Zayda Piedad Morales and Luz, Edna Dora Martin Newman}, year={2016}, month={mar.}, pages={185–195} }