Alternative Safety Methods for Controlling Powdery Mildew in Squash under Field Conditions

Abstract

Almond (Prunus dulcis), camphor (Cinnamomum camphora) and clove (Syzgium aromaticum) crude oils, silicate, Gram-positive bacterium Streptomyces griseus and a fungus Gliocladium virens culture filtrates in addition to Topas-100 EC (10% penconazole) were used to study of their effects on powdery mildew caused by the fungus Erysiphe cichoracearum. Camphor oil (5 ml/L), clove + camphor + almond (2 and 5 ml/L), G. virens filtrate and Topas-100 (240 ppm) completely inhibited the conidial germination after 24, 48 and 72 h. Topas-100 treatment was the most effective treatment in reducing powdery mildew disease severity of squash with an average of 10.34%, followed by clove oil (5 and 10 ml/L), camphor oil (5 and 10 ml/L) and the mixture of clove +

Evaluation of biological control agents for managing squash powdery mildew under greenhouse conditions

“…Squash plants after 45 days were examined periodically and the disease measures were determined using the devised scale (0-5) according to El-Ghanam et al (2018) where 0 = no symptoms appear, 1 = 0.1 to 3% of leaf area covered by the infection, 2 = more than 3 to 10% of leaf area covered by the infection, 3 = more than 10 to 25% of leaf area covered by the infection, 4 = more than 25 to 50% of leaf area covered by the infection, 5 = more than 75% of the plant growth covered by the infection and the plants turned to be stunted.…”

“…The fungicide Topas-100 one of systemic fungicides is more efficient in management of cucumber powdery and downy mildews (Abada et al 2009). Disease severity of squash powdery mildew was reduced with an average of 10.34% when used the fungicide Topas-100 at recommended dose (El-Ghanam et al 2018).…”

Biocontrol of Sphaerotheca fuliginea, the causal agent of powdery mildew of cucumber by using aqueous extracts from five traditional Egyptian medicinal plants

“…Over the past several years, there has been an increase in the quest for plant extracts with anti-ascomycete activity. These studies have shown that plant extracts are effective against S. fuliginea, the fungal pathogen that causes the powdery mildew disease that affects Cucurbitaceae (Al Surhanee 2013;Guginski-Piva et al 2015;Abdu-Allaha and Abo-Elyousr 2017;El-Ghanam et al 2018;Mostafa et al 2021a) There are several ways that plants defend themselves from diseases, such as phenolic complexes, which are secondary plant metabolites. These substances can be found in the root, rhizome, shoot, leaf, and flower of the plant (Houssien et al 2010).…”