AN EFFECTIVE STRATEGY TO REDUCE THE INCIDENCE OF Phytophthora ROOT AND CROWN ROT IN BELL PEPPER

作者：Sanchez Chavez Esteban^*; Victoria Silva Rojas Hilda; Leyva Mir Gerardo; Villarreal Guerrero Federico; Jimenez Castro Jorge A; Molina Gayosso Eduardo; Gardea Bejar Alfonso A; Dolores Avila Quezada Graciela

来源：Interciencia, 2017, 42(4): 229-235.

• Capsicum annuum L.
• ITS Region
• Metam Sodium
• P. capsici
• 'Robusto' Rootstock
• 'Terrano' Rootstock

This work evaluated the effectiveness of combining grafted bell pepper and metam sodium fumigated soil to reduce the incidence of Phytophthora root and crown rot, a disease that significantly reduces crop yields. The experiment was carried out during 2011 in Chihuahua, Mexico. Six trials were established in a previously fumigated soil using 'Facinato' variety grafted onto 'Robusto' and 'Terrano' rootstocks, besides four self-rooted varieties. To identify the pathogen, ribosomal loci corresponding to the ITS region were amplified and sequenced. The general linear model described the increase in disease incidence in all trials. Grafted plants had a lower slope of disease incidence than the four self-rooted varieties. Results indicated that final disease incidence (Yf) of the varieties ranged 37-69%, while grafted plants exhibited a Yf of only 13-16%. Fumigation caused a better reduction of disease incidence when used for grafted plants. Disease onset and slope increase coincided with the possible fumigant degradation. These findings expand present knowledge regarding plant response to preventive fumigations and grafted plants use to decrease natural infection in bell pepper plants caused by this oomycete.

• 出版日期2017-4