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Abstract

The fumigant pesticide methyl bromide (MB) is no longer used in most countries due to its carcinogenic effects. It is followed by carbon bisulfide and chloropicrin which are the most effective liquid synthetic chemicals in pesticide formulations. They are converted to gas to penetrate soil particles and eliminate plant pests such as insects, weeds, and causal plant diseases of viruses, bacteria, fungi, and nematodes under greenhouse, field and storage conditions. These fumigants are non specific pesticides and highly hazardous to humans, environmental resources, and deplete the ozone layers. Furthermore, increasing the cost of crop production by inceasing the amount of pesticides treatments was increased the cost of research on the alternatives of green pesticides from eco-friendly agents, natural organic soil amendments of organic wastes, green manure, biofumigation crops, compost, and essential oils, as well as formulations, are examples of this. Organic fumigants that are non toxic, non-residual, highly degradable and decomposable are available as eco-friendly alternatives to chemical pesticides to manage soil borne pests and diseases of plants. This article summarizes the development of applicable eco-friendly formulations which use natural organic materials to disinfest soil in order to reduce plant diseases caused by soil- -borne pathogens.
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Authors and Affiliations

El-Sayed Hussein Ziedan
1

  1. Plant Pathology Department, National Research Centre (NRC), Dokki, Giza, Egypt
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Abstract

This work was carried out during two successive seasons (2016 and 2017) on cucumber fruits from a plastic greenhouse and from open field cultivation in El Gharbeia and El Giza Governorates, Egypt. Isolation trials from spoilage fruit samples of plastic greenhouse cultivation recorded high frequency of Alternaria tenusinium, Fusarium spp. and Pleospora alli. The most common fungi of rotten cucumber fruits from an open field were Galactomyces spp. and Fusarium spp. Pathogenicity tests proved that, Fusarium solani from El-Gharbeia followed by A. tenusinium from El-Giza were the most frequent isolates responsible for rot of cucumber fruits from plastic greenhouse cultivation. Moreover, the most frequent isolates causing postharvest disease of cucumber fruits of the open field were Galactomyces candidium from El-Giza followed by Geotrichum sp. and F. fujikuroi from El-Gharbeia Governorates, respectively. This is the first report of several fungi causing postharvest fruit rot disease of cucumber i.e., G. candidium, Geotrichum sp., A. tenusinium, P. alli and Fusarium spp. (F. fujikuroi, F. verticiolides, F. solani, F. geraminearium and Fusarium incarnatum). Fungal isolates were identified according to cultural, morphological and molecular characterization based on sequencing of internal transcribed spacer1 (ITS1). All the ITS nucleotide sequences of fungi were applied and conserved in GenBank.

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Authors and Affiliations

El Sayed Hussein Ziedan
Abd El-Nasser Abd El-Hafez Khattab
Ahmed Farahat Sahab
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Abstract

This study was executed to investigate the potential of agar-agar, a nontoxic and non-degradable

gelling agent, as a promising coating agent to improve and protect banana fruit

against fungal postharvest diseases i.e., crown, finger, neck and flower end rots which are

caused by fungal isolates of Colletotrichum musae and Fusarium moniliforme. Coated-ba-nana

fruit samples with different concentrations of agar-agar suspension particularly at

2.0 g · l−1 exhibited a significant reduction in incidence and severity of postharvest diseases

compared to untreated fruit. Banana fruits dipped in agar suspension at 2.0 g · l−1 for 5, 10

and 15 min showed significant reduction in disease incidence and severity. Moreover,

application of agar suspension as a coating agent at 2.0 g · l−1 significantly decreased

weight loss (%), firmness loss (%), and soluble solid concentration of banana fruit for

15 days at 25 ± 2°C. Scanning electron microscopy observation confirmed that the fruit

coated with agar colloid at 2.0 g · l−1 had significantly fewer cracks and showed smoother

surfaces than untreated fruit. This explains the quality improvement in agar-coated fruit

compared to uncoated fruit. Overall, agar colloid, a safe coating agent, could be used to

protect banana fruit against postharvest rot diseases and extend fruit storage life during

ripening and storage.

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Authors and Affiliations

El Sayed Hussein Ziedan
Hassan Mohamed El Zahaby
Hanafey Farouk Maswada
El Hassan Abd El Rafh Zoeir

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