Sydney NSW, Australia
Identification request
2018-10-01T02:00:00.0000000Z
2
Damage (cyclone) to dragon fruit, Saipan
To: pestnet@yahoogroups.com
Subject: [pestnet] Dragon Fruit plants [2 Attachments]Hi Pestnet group, I need your expertise to identify the disease on my client dragon fruit plants. This appeared right after typhoon Mangkhut passed Saipan. See attached photos. Thanks!
Posted on user's behalf
Subject: [pestnet] Dragon Fruit plants [2 Attachments]Hi Pestnet group, I need your expertise to identify the disease on my client dragon fruit plants. This appeared right after typhoon Mangkhut passed Saipan. See attached photos. Thanks!
Arnold Route
Posted on user's behalf
Responses
0
2018-10-03T14:00:00.0000000Z
Hi Arnold,It looks bacterial.In which case cut off affected areas with a sterilised tool (if possible a centimetre or two beyond the lesions), take them away and burn them or bury them making sure that no bits are left behind during transport, and spray the remaining plants with copper.What do you think Bob?Regards,Kerry
Kerry Everett (PhD)
Senior Scientist
T: +64 9 925 7133
M: +64 212268133
F: +64 9 925 7001
E: kerry.everett@plantandfood.co.nz
www.plantandfood.co.nz
The New Zealand Institute for Plant & Food Research Limited
Postal Address: Plant & Food Research
Private Bag 92169, Auckland Mail Centre, Auckland 1142, New Zealand
Physical Address: Plant & Food Research
120 Mt Albert Road, Sandringham, Auckland 1025, New Zealand
Posted on user's behalf
0
2018-10-05T14:00:00.0000000Z
From: pestnet@yahoogroups.com
<pestnet@yahoogroups.com> on behalf of Bob Fullerton
bob.fullerton@plantandfood.co.nz [pestnet] <pestnet@yahoogroups.com>
Sent: Sunday, October 7, 2018 11:53 PM
To: pestnet@yahoogroups.com
Cc: Hieu Nguyen Thanh; ThuyLinh Dang
Subject: RE: [pestnet] Dragon Fruit plants Hi ArnoldI have consulted my pathologist colleagues, Mr Hieu and Ms Linh, both highly experienced with dragon fruit diseases here in Vietnam and we are in agreement that is most likely a bacterial infection. This is also in agreement with Kerry Everett’s diagnosis. Bacterial infections are promoted by strong winds and driving rain which is consistent with your observation that the problem followed a hurricane. Various species of pathogenic bacteria including Xanthomonas campestris, Erwinia carotovoa andErwinia chrysanthemi have been recorded from rotted dragon fruit cladodes in different parts of the world. It is not possible to tell from the symptoms which species is causing your problem but the remedy will be the same. The advice given by Ms Linh to growers with a similar problem in Vietnam is to remove all infected material (either whole cladodes or cut back to healthy tissue) and spray the plants with a copper fungicide. Ms Linh also advises to apply lime as there was an association between calcium deficiency and bacterial soft rot in Mexico. The diseased cladode material should be taken well away from the plantation and burned or buried as it will be full of bacteria which could recontaminate the orchard during another spell of heavy rain and wind. Several sprays of copper would be advisable to minimise the risk of new infections as there will obviously be a heavy population of bacteria in the canopy after an epidemic like that. With rigorous hygiene and copper protection I am sure the orchard can be retrieved.Good luck
Principal Scientist
T: +64 9 925 7131
M: +64 212268131
F: +64 9 925 7001
E: bob.fullerton@plantandfood.co.nz
www.plantandfood.co.nz
The New Zealand Institute for Plant & Food Research Limited
Postal Address: Plant & Food Research
Private Bag 92169, Auckland Mail Centre, Auckland 1142, New Zealand
Physical Address: Plant & Food Research
120 Mt Albert Road, Sandringham, Auckland 1025, New Zealand
Posted on user's behalf
Sent: Sunday, October 7, 2018 11:53 PM
To: pestnet@yahoogroups.com
Cc: Hieu Nguyen Thanh; ThuyLinh Dang
Subject: RE: [pestnet] Dragon Fruit plants Hi ArnoldI have consulted my pathologist colleagues, Mr Hieu and Ms Linh, both highly experienced with dragon fruit diseases here in Vietnam and we are in agreement that is most likely a bacterial infection. This is also in agreement with Kerry Everett’s diagnosis. Bacterial infections are promoted by strong winds and driving rain which is consistent with your observation that the problem followed a hurricane. Various species of pathogenic bacteria including Xanthomonas campestris, Erwinia carotovoa andErwinia chrysanthemi have been recorded from rotted dragon fruit cladodes in different parts of the world. It is not possible to tell from the symptoms which species is causing your problem but the remedy will be the same. The advice given by Ms Linh to growers with a similar problem in Vietnam is to remove all infected material (either whole cladodes or cut back to healthy tissue) and spray the plants with a copper fungicide. Ms Linh also advises to apply lime as there was an association between calcium deficiency and bacterial soft rot in Mexico. The diseased cladode material should be taken well away from the plantation and burned or buried as it will be full of bacteria which could recontaminate the orchard during another spell of heavy rain and wind. Several sprays of copper would be advisable to minimise the risk of new infections as there will obviously be a heavy population of bacteria in the canopy after an epidemic like that. With rigorous hygiene and copper protection I am sure the orchard can be retrieved.Good luck
Bob Fullerton
Principal Scientist
T: +64 9 925 7131
M: +64 212268131
F: +64 9 925 7001
E: bob.fullerton@plantandfood.co.nz
www.plantandfood.co.nz
The New Zealand Institute for Plant & Food Research Limited
Postal Address: Plant & Food Research
Private Bag 92169, Auckland Mail Centre, Auckland 1142, New Zealand
Physical Address: Plant & Food Research
120 Mt Albert Road, Sandringham, Auckland 1025, New Zealand
Posted on user's behalf