MANEJO ALTERNATIVO DO OÍDIO NA CULTURA DO PEPINO EM AMBIENTE PROTEGIDO Alternative management of powdery mildew in cucumber under protected cultivation

2013 ◽  
Vol 11 ◽  
pp. 103 ◽  
Author(s):  
Leônidas Leoni Belan ◽  
Amilton José Pereira ◽  
Márcio José Vieira de Oliveira ◽  
Dimmy Herllen Silveira Gomes Barbosa ◽  
Waldir Cintra de Jesus Junior ◽  
...  
Keyword(s):  
Powdery Mildew ◽  
Alternative Management ◽  
Protected Cultivation

O manejo do oídio na cultura do pepino é realizado basicamente por aplicação de agroquímicos. O uso indiscriminadodesses produtos pode provocar fitotoxidez, surgimento de populações resistentes do patógeno, alémda contaminação do agroecossistema e dos alimentos. O presente estudo foi conduzido em casa de vegetação,seguindo delineamento inteiramente casualizado com onze tratamentos e cinco repetições. Avaliou-se a eficiênciade tratamentos, convencionais e alternativos, para o manejo do oídio na cultura do pepino, bem comoo potencial fitotóxico, o efeito dos mesmos sobre as características de crescimento e o potencial produtivo dacultura. Exceto o extrato alcoólico de própolis, todos os demais tratamentos testados reduziram a severidadedo oídio em relação à água destilada; no entanto, os tratamentos tebuconazole, oxicloreto de cobre, enxofreinorgânico, fosfito de cobre, extrato à base de óleo de nim, acibenzolar-S-metil, silicato de potássio, urina devaca e leite in natura foram eficientes no controle da doença. Nas condições experimentais, o fungicida tebuconazoleprovocou fitotoxidez nas plantas de pepino. Os tratamentos fosfito de cobre, urina de vaca, leite in natura,acibenzolar-S-metil e oxicloreto de cobre proporcionaram maior produção de frutos pelas plantas. Excetonos tratamentos com tebuconazole e com enxofre inorgânico, não houve sintomas de toxidez nas plantas.

scholarly journals Powdery mildew of ornamental species caused by Oidiopsis haplophylli in Brazil

2007 ◽  
Vol 33 (4) ◽  
pp. 405-408 ◽  
Author(s):  
Ailton Reis ◽  
Leonardo Silva Boiteux ◽  
Milton Luiz Paz-Lima
Keyword(s):  
Powdery Mildew ◽  
Sweet Pepper ◽  
Field Conditions ◽  
Host Specialization ◽  
Eustoma Grandiflorum ◽  
Zantedeschia Aethiopica ◽  
Calla Lily ◽  
Protected Cultivation ◽  
Ornamental Crops ◽  
Ornamental Species

Oidiopsis haplophylli (syn. Oidiopsis sicula) was identified as the causal agent of powdery mildew diseases occurring on five ornamental species in Brazil. This disease was observed in plastic house-grown lisianthus (Eustoma grandiflorum: Gentianaceae), in nasturtium (Tropaeolum majus: Tropaeolaceae) cultivated under open field conditions and in greenhouse-grown calla lily (Zantedeschia aethiopica: Araceae), impatiens (Impatiens balsamina: Balsaminaceae) and balloon plant (Asclepias physocarpa: Asclepiadaceae). Typical disease symptoms consisted of chlorotic areas on the upper leaf surface corresponding to a fungal colony in the abaxial surface. With the disease progression, these chlorotic areas eventually turned to necrotic (brown) lesions. Fungi morphology on all hosts was similar to that described for the imperfect stage of Leveillula taurica (O. haplophylli). The Koch's postulates were fulfilled by inoculating symptom-free plants via leaf-to-leaf contact with fungal colonies. Additional inoculations using an isolate of O. haplophylli from sweet pepper (Capsicum annuum) demonstrated that it is pathogenic to all five species belonging to distinct botanical families, indicating lack of host specialization. This is the first formal report of a powdery mildew disease on lisianthus, calla lilly, impatiens and nasturtium in Brazil. It is, to our knowledge, the first report of O. haplophyllii infecting A. physocarpa, extending the host range of this atypical powdery mildew-inducing fungus. This disease might become important on these ornamental crops especially in protected cultivation and also under field conditions in hot and dry areas of Brazil.

Microscopy studies of powdery mildew on summer squash

1991 ◽  
Vol 49 ◽  
pp. 520-521
Author(s):  
John S. Gardner ◽  
W. M. Hess
Keyword(s):  
Powdery Mildew ◽  
Tip Growth ◽  
Hyphal Growth ◽  
Plant Tissues ◽  
Vegetative Hypha ◽  
Powdery Mildews ◽  
Summer Squash ◽  
Conidial Formation ◽  
Polar Tip Growth ◽  
Short Conidiophore

Powdery mildews are characterized by the appearance of spots or patches of a white to grayish, powdery, mildewy growth on plant tissues, entire leaves or other organs. Ervsiphe cichoracearum, the powdery mildew of cucurbits is among the most serious parasites, and the most common. The conidia are formed similar to the process described for Ervsiphe graminis by Cole and Samson. Theconidial chains mature basipetally from a short, conidiophore mother-cell at the base of the fertile hypha which arises holoblastically from the conidiophore. During early development it probably elongates by polar-tip growth like a vegetative hypha. A septum forms just above the conidiophore apex. Additional septa develop in acropetal succession. However, the conidia of E. cichoracearum are more doliform than condia from E. graminis. The purpose of these investigations was to use scanning electron microscopy (SEM) to demonstrate the nature of hyphal growth and conidial formation of E. cichoracearum on field-grown squash leaves.

Chromosomal location of genes for resistance to powdery mildew in Chinese wheat lines Jieyan 94-1-1 and Siyan 94-1-2

Hereditas ◽  
2002 ◽  
Vol 136 (3) ◽  
pp. 212-218 ◽  
Author(s):  
XIU QIANG HUANG ◽  
SAI L. K. HSAM ◽  
FRIEDRICH J. ZELLER
Keyword(s):  
Powdery Mildew ◽  
Chromosomal Location ◽  
Wheat Lines ◽  
Chinese Wheat

Incidence of powdery mildew on cucurbit plants in Katsina, Nigeria

2019 ◽  
pp. 05-09
Keyword(s):  
Powdery Mildew ◽  
Low Cost ◽  
Frequency Of Occurrence ◽  
Sphaerotheca Fuliginea ◽  
Causal Organism ◽  
Powdery Mildews ◽  
Powdery Mildew Disease ◽  
Important Disease

The presence study deals with powdery mildews in various cucurbits in Katsina city (Barhim Estate, Kofar Durbi, Kofar Sauri, Kofar Marusa and Low Cost), Nigeria. The finding shows that the areas infested with powdery mildew is one of the important disease of cucurbits. The Sphaerotheca fuliginea was identified to be the causal organism present on all observed cucurbits in the study. Highest frequency of disease was found in Kofar Sauri(79%) fallowed by Kofar Marusa (68%), Kofar Durbi (66%), Barhim Estate (65%) and the lowest frequency of occurrence of disease was found in Low Cost (55%).The intensity of the disease was moderate to severe in general but it was high in many fields, the area-wise variation was also noticed. On vegetables, the highest frequency of occurrence of powdery mildew disease was observed on L. cylindrica (76.4%) followed by C. moschata (60%), C. sativus (59.3%), C. vulgaris (53.9%) and lowest was found on C. melo (44.4%). The highest intensity of disease was found on C. moschata, followed by L. cylindrica, C. sativus, C. vulgaris and C. melo.

Impact of the estimated doses of mineral fertilizers on the infestation mildew, pyrenophora and yield of winter wheat varieties

2020 ◽  
Author(s):  
A.Y. Ozheredova ◽  
◽  
A. N. Esaulko ◽  
L.A. Mikhno ◽  
A.P. Shutko ◽  
...  
Keyword(s):  
Powdery Mildew ◽  
Winter Wheat ◽  
Mineral Fertilizers ◽  
Wheat Varieties ◽  
Leached Chernozem ◽  
Winter Wheat Varieties

The article presents materials on the influence of calculated doses of mineral fertilizers on the incidence of powdery mildew, pyrenophorosis and yield of winter wheat varieties cultivated on leached Chernozem for 2016-2018.

Sign in / Sign up

Export Citation Format

Share Document