plantprotect.gr plantprotect.gr
Weather Sign in
Crops

Walnut (5)

Pests and diseases of walnut: identification from the symptoms, with a diagnostic tool

Pests and diseases of walnut: identification from the symptoms, with a diagnostic tool

Twenty causes, each with the one feature that separates it in the field: anthracnose and blight that produce the same lesion, brown apical necrosis, the pests of the nut, mites and aphids, the branch dieback complex, the cankers of the trunk, blackline at the graft union and the quarantine risk. With a tool that compares the symptoms against the profile of every cause, and two foreign recommendations that are illegal in the European Union today.

Walnut
Walnut blight, Xanthomonas arboricola pv. juglandis

Walnut blight, Xanthomonas arboricola pv. juglandis

An aggressive disease that can take more than half the crop. The correct name of the pathogen, overwintering inside the dormant buds and why that load can be measured, the brown apical necrosis and vertical oozing canker forms, the per-tree risk scale counted in June, and the prayer-stage timing that is usually missed by ten days.

Walnut
Walnut anthracnose: diagnosis and control

Walnut anthracnose: diagnosis and control

The most important fungal disease of walnut in Greece, found on almost every holding and capable of taking the whole crop. The correct name of the pathogen, the scale of the losses, differential diagnosis, the temperatures and humidity it needs, cultivar susceptibility and where Chandler stands, and the cultural measures without which the sprays do not hold.

Walnut
Walnut cultural practice: establishment, spacing, irrigation and nutrition

Walnut cultural practice: establishment, spacing, irrigation and nutrition

Establishment decisions lock in the yield ceiling for forty years. In detail: the soil specifications, rootstock choice by problem, lateral bearing, why Chandler is protandrous and what that means for the pollinizer, the rule of 112 kg per hectare for each 1% of light intercepted, irrigation by stem water potential, the nitrogen and potassium budgets, and the three findings that overturn common practice.

Walnut
Pruning the walnut tree

Pruning the walnut tree

Terminal and lateral bearing and what they change in the cut, the cultivars grown in Greece with their pollination, training to an open vase and to a central leader, scaffold angles and spacing, the finding that young trees do better with no pruning at all, and the timing that costs trees rather than a crop when it is got wrong.

Walnut