Symptoms and Control Methods of White Rust in Morning Glory: A Detailed Guide

The morning glory has a very distinctive appearance and is an annual twining herbaceous vine, but white rust is a fairly common disease of morning glory, and if prevention and control are neglected, it can easily reduce the ornamental value of the plant. So what are the symptoms of white rust in morning glory? And how should it be prevented and controlled?

Morning glory

I. Symptoms

The affected parts are mainly the leaves, leaf stalks and tender stems. On affected leaves, small light green spots first appear. They then gradually turn pale yellow with indistinct edges, and in severe cases expand into large lesions; later, white scab-like protrusions form on the underside of the diseased areas, and when they rupture they release a white powdery substance, which is the cystospores of the pathogen. When tender stems are affected, the flowers and stems become distorted, and when lesions encircle the leaf stalk or tender shoot, the host parts above the girdle grow poorly, shrivel and die.

II. Pathogen and Disease Pattern

The pathogen is Albugo ipomoeae-panduranae, a fungus of the genus Albugo. The pathogen overwinters as oospores in diseased tissue. In the following spring, the oospores germinate and produce sporangia, which infect morning glory and other plants of the Convolvulaceae. The peak disease period is generally from August to September, and morning glory seeds can carry the pathogen and become the source of infection the following year.

III. Control Methods

1. Promptly pull up diseased plants and destroy them, to reduce infection of the seeds.

2. Select and keep disease-free seeds for propagation, and disinfect the seeds before sowing. Avoid crop rotation with plants of the Convolvulaceae.

3. In the early stage of the disease, spray with Bijunsha at 1000-1500 times dilution or 50% Yimeijing at 500 times dilution, spraying once every 10-15 days for a better control effect.

Symptoms and Prevention Methods of White Rust in Morning Glory

White rust in morning glory is a disease often encountered when growing morning glory at home. Today we will look at the symptoms and prevention methods of white rust in morning glory.

1. Symptoms The lesions are initially pale yellow with no obvious edges, and in severe cases many lesions merge into large patches that encircle the leaf stalk and tender branches, causing the flowers and stems to become distorted and shriveled and the plant to grow poorly. Later, powdery conidia are released from the small white raised pustules. It affects leaves, leaf stalks, tender stems and flowers.

2. Disease characteristics Morning glory seeds carry the pathogen, which becomes the source of the first infection the following year.

Symptoms and Prevention Methods of White Rust in Morning Glory

Control methods: Strengthen fertilizer and water management, improve environmental conditions, burn diseased plants and fallen leaves, clear weeds, and reduce sources of the disease. In the early stage of the disease, spray Bordeaux mixture once every 15 days, for two or three sprayings in total.

Control Methods for White Rust in Morning Glory

   White rust in morning glory occurs every year at the Shanghai Botanical Garden.
   (1) Symptoms The lesions of white rust in morning glory are initially pale yellow with no obvious edges, and in severe cases many lesions expand and merge into large patches that encircle the leaf stalk and tender shoots, causing the flowers and stems to become distorted and shriveled and the plant to grow poorly. Later, powdery conidia are released from the small white raised pustules. It affects the leaves and leaf
stalks, tender stems and flowers of morning glory.
   (2) Occurrence characteristics The pathogen overwinters as oospores in diseased tissue and becomes the source of the first infection the following year. The disease is widespread every year from August onward.
   (3) Control methods Remove infected plants and leaves and stems, improve environmental conditions, eliminate weeds, and reduce sources of the disease. Apply 1% Bordeaux mixture, spraying once every half month, for two or three consecutive sprayings.