The role of phenolic compounds in the defense of sooty mold of olive leaves (Olea europea L.)

The harmful effects of wax scale insect C.rusci L. on fig trees cultivated widely in the Al-Kifl district / southern Babylon governorate in the last two years was the main reason for designing this study. The study involved experiments; the first was a field survey to have scientific evidence about the widespread of C. rusci and estimated the infection rate in plants, then tried to find a relationship between environmental factors in this area and studied insects. The second experiment deals with the efficacy of some factors (egg locations, temperature and time) on egg hatching of C.rusci. The results provided good information about fig plants' temperature and infection rates with C. rusci. The range of temperature degrees, which showed a high level of infection, was 26.5-33.4 ºC. Meanwhile, the highest infection rate was recorded in October, followed by June. The second experiment showed that temperature was a limiting factor for egg hatching; therefore, there was no hatching of C.rusci eggs when the temperature was below 15 ºC. When the temperature is above this level (15 ºC), a new limitation factor appears in the egg's location. This experiment proved that the existence of an egg under a fold, which covers the insect, is necessary for egg hatching. Keywords: Ceratoplastes rusci, Temperature, Field survey, Egg hatching.

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Effect of Non-conventional Chemicals and Synthetic Fungicide on Biochemical Characteristics of Chilli against Fruit Rot Pathogen Colletotrichum capsici

Geat¹,

Singh²

2016

J Plant Pathol Microbiol

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to evaluate the effect of non-conventional chemical viz., salicylic acid, zinc sulphate, magnesium sulphate, indole acetic acid, indole butyric acid and fungicide viz., carbendazim, on total phenol, flavonol, tannin and electrolyte leakage of red fruits of chilli varieties (susceptible-Pusa Jwala and resistant-Sadabahar) against Colletotrichum capsici the causal agent of fruit rot in chilli. The phenol content was increased significantly in both the varieties (resistant and susceptible) when sprayed with salicylic acid followed by pathogen as compared to other non-conventional chemicals at 24 and 48 hrs intervals. The increase in total phenol was more pronounced in resistant variety (7.84 mg/g fresh weight) after 48 hrs, when sprayed with salicylic acid at 5 mM concentration. Flavonol content was higher in uninoculated red fruits of susceptible variety (1.50 mg/g fresh weight) as compared to resistant (1.37 mg/g fresh weight). Tannin content was higher in resistant (3.71 mg/g fresh weight) as well as susceptible (3.09 mg/g fresh weight) varieties after inoculation than uninoculated varieties (1.38 and 1.02 mg/g fresh weight, respectively) at 5 mM concentration. The activity of electrolytes was more pronounced in resistant variety as compared to susceptible variety when sprayed with non-conventional and fungicide in all the concentration. Electrolytes leakage was more when sprayed with fungicide as compared with salicylic acid 5mM concentration after 48 hrs of pathogen inoculation.

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The role of phenolic compounds in the defense of sooty mold of olive leaves (Olea europea L.)

Cited by 4 publications

References 13 publications

Exogenous melatonin alleviates sooty mould on tea plants (Camellia sinensis L.)

Exogenous melatonin alleviates sooty mould on tea plants (Camellia sinensis L.)

Field survey of fig wax scale insect Ceroplastes rustic L. (Hemiptera: Coccidae) in fig fields of Al-Kifl district/Babylon Governorate and study the effect of some environmental factors on egg hatching

Effect of Non-conventional Chemicals and Synthetic Fungicide on Biochemical Characteristics of Chilli against Fruit Rot Pathogen Colletotrichum capsici

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