EFFICIENCY OF CHEMICAL AND BIOCONTROL AGENTS TO CONTROL MACROPHOMINA PHASEOLINA ON WATER MELON | ||
| The Iraqi Journal of Agricultural Science | ||
| Article 1, Volume 45, Issue 2, March 2014, Pages 185-195 | ||
| Authors | ||
| M. N. Qasem; S. H. Smair; A. S. Ahmed | ||
| Abstract | ||
| This study was conducted to evaluate the activity of the fungicides, Beltanol, Elsa, Topsin, Dividend and Flint with Trichoderma harzianum and Pseudomonas fluorescens against Macrophomina phaseolina, the causal agent of charcoal rot on melon. Results indicated that the T. harzianum had high antagonism ability (antagonism degree was 2 according to the used System on PDA) against M. phaseolina. The bacteria P. fluorescens achieve complete inhibition of M. phaseolina. Results revealed that combination between Flint and P. fluorescens achieved highest percentage of seed germination and lowest disease severity 96.7 and 11.1 respectively. However, there was no significant differences compared to treatments of Beltanol+ P. f., Flint+ T. h. , Elsa + T. h., Beltanol + T. h., Flint, Elsa in percentage of germination which was 93.3, 86.6, 83.3, 80, 83.3 and 80 respectively. Also, there was no significant difference between the treatment of flint + P. f. and treatment of Flint + T. h. ,Beltanol + P. f., Elsa + T. h . in disease severity which reached 16.6, 16.6 and 19.4 respectively. Activity of different treatment were reflected on increase length of plants and dry weight of shoots and roots of cantaloupe plants .Results showed that there was compatibility between results of greenhouse and field experiment. Treatment of Flint + P. f. showed superiority in increasing percentage of germination and decreased disease severity to 60.7 and 27.8 respectively compared to control treatment (M. phaseolina) 23.8 abd 74.9 respectively. Although, there was no significant difference between most treatment and treatment of flint + P. f., there was significant difference in increasing of seed germination in treatments of Elsa , Beltanol, P. f. 41.6, 44.4 and 41.7 respectively. Activity of fungicide on M. phaseolina was reflected in increasing fruit number and weight of fruit/plant compared to control treatment (M. phaseolina). Results revealed that combination between biorational fungicide and chemical fungicide in half dosage showed high efficacy in controlling M. phaseolina in greenhouse and field experiment. | ||
| Keywords | ||
| Biocontrol; Fungicides; phaseolina; Water melon | ||
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