Late blight caused by Phytophthora infestans - PowerPoint PPT Presentation

1 / 25
About This Presentation
Title:

Late blight caused by Phytophthora infestans

Description:

Late blight caused by Phytophthora infestans – PowerPoint PPT presentation

Number of Views:1595
Avg rating:3.0/5.0
Slides: 26
Provided by: diro5
Category:

less

Transcript and Presenter's Notes

Title: Late blight caused by Phytophthora infestans


1
Late blight caused by Phytophthora infestans
2
Tubers infected with P. infestans
3
Late blight of Potatoes (Phytophthora
infestans)
(Image courtesy of The American Phytopathological
Society)
4
Late blighted potato tubers
5
Evictions
6
(No Transcript)
7
View of test field - Hancock Research Station
1994
8
(No Transcript)
9
Sudden oak death Phytophthora ramorum
10
Sudden oak death Phytophthora ramorum
Sudden oak death Phytophthora ramorum
11
Sudden oak death Phytophthora ramorum
12
Black pod disease of cacao
P. palmivora
P. capsici
P. megakarya
13
(No Transcript)
14
Downy Mildew - Grape Plasmopora viticola Obligate
biotrophic pathogen Photosynthetic area
lost Fruit yield reduced Fruit rot
15
Downy Mildew Symptoms and Signs
Signs
Early symptoms
Late symptoms
Leaf spots are yellowish on upper surface, white
and downy on lower surface. Late-season infection
results in a mosaic of yellow, red, and brown
angular spots.
16
(No Transcript)
17
Downy Mildew Symptoms and Signs
Diseased fruit are off-color, shrivel and become
covered with white, downy fungal growth.
18
(No Transcript)
19
Downy Mildew of Grape
Downy Mildew Plasmopara viticola
Sporangia
  • Source of secondary inoculum
  • Inoculum to new leaves
  • and fruit

20
Dew and rain contributes to duration of leaf
wetness
21
Germination of Zoospores Penetration of germ
tube Highly dependent on duration of free water
on leaf surface
22
(No Transcript)
23
(No Transcript)
24
  • http//vegetablemdonline.ppath.cornell.edu/NewsArt
    icles/Cuc_Downy.htm

http//vegetablemdonline.ppath.cornell.edu/factshe
ets/Onions_Downy.htmClick
25
Albugo candida
Write a Comment
User Comments (0)
About PowerShow.com