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Paper Information

Journal:   AGRICULTURAL SCIENCES AND TECHNOLOGY   2007 , Volume 21 , Number 1 (SPECIAL ISSUE IN PLANT PROTECTION); Page(s) 17 To 24.
 
Paper: 

PIGWEED RESPONSE TO FUNGAL ISOLATES OF VERTICILLIUM DAHLIAE FROM COTTON AND OLIVE IN GORGAN AREA

 
 
Author(s):  ATTAR L., RAHNAMA K.
 
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Abstract: 
Based on host range distribution of fungus Verticillium dahliae and its survival on various weeds, and determination of the fungus, symptom on weed and pathotypes and comparison to symptom on cotton could clear the status of such host to be considered for pathogenicity tests and their susceptibility. Pigweed (Amaranthus retroflexous) is an important weed of cotton field and olive orchard, and also susceptible to fungus Verticillium dahliae. In this study, effects of defoliate and nondefoliate isolates on pigweed were similar. First symptoms of disease development in pigweed, observed 20 days after inoculation. But, in cotton the first symptom of disease was observed 30 days after inoculation. Disease symptom of fungal isolates collected from olive trees appeared as defoliate on pigweed but induced chlorosis associated with wilting in cotton. Only G I isolate from cotton caused seedlings decline of cotton and pigweed. Disease severity of cotton isolates were less on pigweed than cotton plant. Means of colony growth rate of fungal isolates were significantly different by range of temperatures (23, 25, 27, 29°C) which seperated them from each other. Isolates BI, D3, F3 showed more than 50% severity on cotton and only 50% on pigweed. But isolates G1, G2 and G5 showed disease severity of 75-100% on cotton and 8.3-100% on pigweed respectively.
 
Keyword(s): PATHOGENICITY TEST, COTTON, PIGWEED, OLIVE, VERTICILLIUM DAHLIAE
 
References: 
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