Control of Chamomile Powdery Mildew Disease Using Potassien, Citrien and Chitosan

Abstract

The effect of three resistance inducers, i.e. chitosan, citrien and potassien were studied under both greenhouse (2009/2010) and field condition in 2010/2011 and 2011/2012 growing seasons to control powdery mildew disease caused by Sphearotheca fuliginea in chamomile (Matricaria chamomilla). Results showed that all used inducers had decreased disease severity compared to non-treated control. In this respect, chitosan showed the highest effect on decreasing disease severity followed by citrien. Meanwhile, potassien gave the lowest effect. The decrease in disease severity of powdery mildew was positively expressed by an increase in crop parameters, i.e numbers, inflorescences weights, fresh, dry weights of plants and the principal components of chamomile essential oil.

Effect of Sodium Bicarbonate and Oils on Powdery Mildew of Matricaria chamomilla.

“…Chamomile 'Matricaria chamomilla L.' plant is one of the most important medicinal and aromatic plants worldwide and in Egypt (El-Morsy et al, 2013). Chamomile plant, belonging to family Asteraceae (Compositae), mainly cultivated for obtaining the dry fluorescence that containing essential oil which is used in several medicinal industries and preparations of cosmetics compounds (Reda et al, 1999).…”

“…Chamomile powdery mildew frequently occurs in the open field, estimated percentages of infection reaching 20-80% (El-Morsy et al, 2013). In severe infection, diseased plant seems as covered with layer form talk powder and this causes great damage especially for flowers which the important part of the plant, so the disease has negative effect on the quantity and quality of inflorescences yield regarded to the major purpose of chamomile plantation, all the possible procedures should be considered to manage it.…”

Biological control of powdery mildew on chamomile plants

“…The peaks of disease incidence and severity were noticed during February and March this is due to powdery mildew do prefer low sugar content in plant leaves and inflorescences during February and March, the old lower leaves already transfer most of sugar to inflorescences consequently it became susceptible for disease. The most favorable temperature for powdery mildew infection and disease development is 20-300 this range is available during this period (Zaher, 1970, Cheah et al, 1996, Awad, 2004, Pap et al, 2013, El-Morsy & Shalaby, 2013and Mergawy, 2016.…”

Bio-Control of Chamomile Powdery Mildew Using Cyanobacteria and Some Antagonistic Microorganisms

“…Powdery mildew caused by Erysiphe cichoracearum is considered one of the most important diseases attacking chamomile plant in different cultivated areas in Egypt. Chamomile powdery mildew frequently occurs in the open field, estimated percentages of infection reach 20-80% (El-Morsy and Shalaby, 2013). In severe infection, diseased plant seems as covered with a layer of talk powder and this causes great damage especially for flowers which are the important part of the plant, so the disease has negative effect on the quantity and quality of inflorescences yield, so all the possible procedures should be considered to manage it.…”