Manage shot hole and internal cork

Written by   Orchard plant protection guide

Wet conditions in late winter to early spring can activate shot hole spores that have remained dormant in bud scales and twig lesions during the previous season.

Both fruit and leaves can be affected.
Infection requires at least 24 hours of continuous wetness and spores can germinate in temperatures as low as 1C. Rain during budswell helps to spread the disease.
Non-pesticide management.
A fungicide program is usually necessary to control shot hole but a number of other measures can help management.
Be careful that irrigation does not wet the leaves.
Where practical, prune infected wood and burn the prunings.
Hastening leaf fall will reduce the amount of inoculum that builds up during autumn.

Internal cork
Often known as corky pit, internal cork is a physiological disorder usually caused by low soil boron level, heavy liming, heavy crops and drought.
It causes fruit stunting and distortion in both apples and pears.
Cork disorders can be rectified by application of soluble boron compounds, both foliar and soil dressing.
As a soil dressing, apply in winter or early spring every fourth or fifth year, or when symptoms appear. Soil analysis is recommended on a 3-year basis.

See this article in Tree Fruit July 2019

About this website

This website presents articles from the Tree Fruit magazine. 
Here you can find information about fruit growing under specific topics (found in the menu)
REGISTER - and you can read complete feature articles without interruption.

Like what we do?

We produce and distribute Tree Fruit magazine. 
AND we design and maintain this and other websites. 
Discover what we can do for you.
Contact us

FTM logoEmail

Our services

Fruit Tree Media provide a suite of services:
•Design (website, e-commerce, print)
•Writing (editorial, advertorial, testimonials)
•Photography (in the field or studio)

We understand crop production practices: horticulture and broad acre.
We can translate technical information into understandable, effective messages.
What we produce is 'earthy' and direct, but it is also modern and well designed.

See our website for more information or contact us.


Orchard Manuals

Orchard Manuals that help orchardists grow fruit profitably.

Latest orchard management, tree training and fruit production methods.

Easy to follow instructions, many illustrations and photos.
Available as PDF files—ready to download and print!

Find them here
or from our sister site:

Back to top