Diseases Archives - Australian Apple and Pear IPDM

published - 19 March 2020
By David Williams (Agriculture Victoria) and Allan McWaters (QLD DAF)

Bitter Rot (Glomerella)

Bitter Rot (Glomerella) is a disease mostly only found in apples and symptoms mostly develop as the fruit approaches maturity. The rot starts as small light brown circular spots that rapidly enlarge to form saucer shaped depressions. Under humid conditions gelatinous salmon pink masses of spores may be produced on …
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Bitter Rot, Glomerella

Diseases

published - 28 January 2020
By Alison Mathews (DPIRD WA)

Apple Scab in WA and fungicide resistance

Andrew Taylor of DPIRD spoke about apple scab and fungicide resistance at the recent Apple and Pear IPDM field day in Manjimup, Western Australia. Andrew, in collaboration with Curtin University, recently completed a project that collected scab samples from a number of orchards in various apple growing areas around the …
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apple scab, fungicide resistance, WA

Diseases, Resources

published - 30 October 2019
By Kevin Dodds (NSW DPI)

Do I have Primary Scab infection? ……and what does this mean for my Summer-Autumn spray program?

Black spot otherwise known as apple and pear scab (caused by the fungal pathogens Venturia inequalis and V.pirina), survives through Winter as spore bodies mostly on fallen leaves under your trees. In pears, the disease might also overwinter on infected shoots. In Spring during rainfall events, these spore bodies release …
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black spot, scab

Diseases

No Black Spot Warning (Queensland only) 15th October 2019

Rain last night did not cause a black spot infection period. Rainfall was apparently very patchy across the Granite Belt but significant falls of 4-6 mm occurred. The rain fell from around 2.30 a.m. and despite the early morning fog, leaves were dry by 10.00 a.m. It is doubtful that …
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black spot, grower alert, warning

Diseases, Home, QLD

published - 12 October 2019
By Peter Nimmo (Queensland Dept Agriculture and Fisheries)

Black Spot Warning 11 October 2019

Rain this morning Friday, 11 October, has triggered a black spot ascospore release in most orchards across the district. Apple leaves remained wet well into the afternoon with further rain on the horizon. Pozieres, Cottonvale and Thulimbah orchards have a higher risk of sustained leaf wetness, with orchards to the …
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black spot

Diseases

published - 1 October 2019
By Dr Jacqueline Edwards (Plant Pathologist, Agriculture Victoria)

Botryosphaeria

Failed graft union in a young apple tree and Botryosphaeria was diagnosed as the cause (Photo: J Edwards, DJPR)
Many trees and shrubs can be attacked by fungi and bacteria that cause cankers that lead to dieback. Cankers are lesions in the bark of the trunk (stem), branches or twigs and …
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Botryosphaeria, fungi, tree wounds

Diseases

published - 18 September 2019
By Emily Crawford (Agriculture Victoria) and Russell Fox (IK Caldwell)

In a dry spring, plan for Powdery

In a dry Spring when spraying for Black Spot is unlikely to occur, it’s important to plan for Powdery Mildew.
Especially in new varieties of apples, more Powdery Mildew is being seen and it tends not to russet as much as in older varieties.
Look out for signs of powdery mildew in …
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pink, powdery mildew

Diseases

published - 21 June 2019
By Emily Crawford (Agriculture Victoria)

Monitor while pruning to get ahead

Pruning is an opportunity to monitor for diseases and pests so you are ahead of the game later in the season. Take a moment to educate your pruning staff to look for evidence of key pests and diseases while they are working among your trees. Watch out for:

ERM and Bryobia …
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Bryobia mite, european red mite, monitoring, San Jose Scale, snails, Wood Rotting fungi, woolly aphid

Diseases, Pests

published - 14 May 2019

Scab (Black Spot) Management

Scab can be an issue in apple and pear orchards.
In the following two videos David Williams (Principal Research Scientist at Agriculture Victoria) discusses ground cover management and early season management techniques to minimise and control Scab.
Scab ground cover management:

Early season Scab management:

Reviewed by Kevin Dodds, NSW DPI.

apple scab, black spot, ground cover management, pear scab, scab

Diseases

published - 20 March 2019
By Emily Crawford (Agriculture Victoria) and Kevin Dodds (NSW DPI)

Post harvest Scab control

Sweeping and mulching leaves, and the application of foliar Nitrogen, hastens leaf decomposition and reduces the number of Scab spores that survive into the following season (Photo: Crendon Machinery)
Autumn is the time when Black spot (apple and pear scab) spores prepare to over-winter and become a source of infection in …
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apple scab, black spot, pear scab, scab

Diseases