Characteristics of Phomopsis juglandina (Sacc.) Hohn. Associated with Dieback of Walnut in the Climatic Conditions of Southern Romania

被引：3

作者：

Mihaescu, Cristina ^{[1
]}

Dunea, Daniel ^{[2
]}

Basa, Adrian Gheorghe ^{[3
]}

Frasin, Loredana Neagu ^{[2
]}

机构：

[1] Univ Pitesti, Fac Sci, Targu Din Vale St 1, Pitesti 110040, Romania

[2] Valahia Univ Targoviste, Fac Environm Engn & Food Sci, Aleea Sinaia,13, Targoviste 130004, Romania

[3] Univ Agron Sci & Vet Med Bucharest, Fac Agr, 59 Marasti Blvd,Dist 1, Bucharest 011464, Romania

来源：

AGRONOMY-BASEL | 2021年 / 11卷 / 01期

关键词：

Phomospsis juglandina; Juglans regia; pathogen; die back; walnut twig blight; evapotranspiration;

D O I：

10.3390/agronomy11010046

中图分类号：

S3 [农学（农艺学）];

学科分类号：

0901 ;

摘要：

Phomopsis juglandina (Sacc.) Hohn., which is the conidial state of Diaporthe juglandina (Fuckel) Nitschke, and the main pathogen causing the dieback of branches and twigs of walnut was recently detected in many orchards from Romania. The symptomatological, morphological, ultrastructural, and cultural characteristics, as well as the pathogenicity of an isolate of this lignicolous fungus, were described and illustrated. The optimum periods for infection, under the conditions prevailing in Southern Romania, mainly occur in the spring (April) and autumn months (late September-beginning of October). Strong inverse correlations (p < 0.001) were found between potential evapotranspiration and lesion lengths on walnut branches in 2019. The pathogen forms two types of phialospores: alpha and beta; the role of beta phialospores is not well known in pathogenesis. In Vitro, the optimal growth temperature of mycelial hyphae was in the range of 22-26 degrees C, and the optimal pH is 4.4-7. This pathogen should be monitored continuously due to its potential for damaging infestations of intensive plantations.

引用

页数：16