Efficacy of repeated spray of neem oil for control of gray mold disease of lentil plants caused by Botrytis cinerea and on some of the chemical components of lentil seeds | ||
| Journal of Pest Control and Environmental Sciences | ||
| Volume 15, Issue 1, June 2007, Pages 43-67 PDF (477.78 K) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/jpces.2007.459646 | ||
| Authors | ||
| M. M. H. Rahhal* 1; I. A. Ismail1; A. A. Rahmou2 | ||
| 1Plant Pathology Research Institute, ARC., Giza, Egypt | ||
| 2Soils, Water and Environ. Research Institute, ARC.,Giza, Egypt. | ||
| Abstract | ||
| Neem oil at concentrations of 2.5, 5.0, 7.5 and 10 % were tested in vitro using Petri dishes. These concentrations decreased the radial growth of Botrytis cinerea by 27.31, 39.54, 94.46 and 100.00%, respectively. Also, Dithane M 45 decreased the fungal growth by 39.00, 49.29 and 100.00% at the concentrations of 50, 150 and 250 ppm, respectively. Field experiments were carried out at Etay El-Baroud Agriculture Research Station Farm, El-Behera Governorate during 2002/03, 2003/04 and 2004/05 growing seasons to find out the effect of neem oil repeated spray for the management of Botrytis gray mold (B. cinerea) of lentil (Lens culinaris) and on some chemical components of lentil seeds under field natural infection conditions. Treatments were used of water spray (N0), Neem oil 5 % spray; once only (N1), twice (N2), and three times (N3), 15 days intervals. Five varieties of lentil were sown; Sinai 1, Giza 370, Giza 9, Giza 51 and Giza 4. Sinai 1 was the most sensitive to infection where the disease incidence in the check treatment (N0) ranged from 66.67 to 56.67 % in seasons 2002/03 and 2003/04, respectively and the disease reduction ranged from 85.00 to 70.58 % in the treatment (N3). On the other hand, Giza 51 was the most resistance to the infection where the disease incidence in (N0) treatment ranged from 33.33 to 25.00 % and it decreased to 10.00 and 11.67 % in (N3) treatment in the above two growing seasons, respectively. Generally, there is a correlation between neem oil repeated spray and the improvement of lentil agronomic characters. Comparative study of repeated spray of neem oil and Dithane M 45 three times cleared that neem oil repeated spray decreased gray mold incidence in Giza 9 and Sinai 1 with 67.74 and 44.44% in season 2003/04 and 55.16 and 25.93% in season 2004/05, respectively. Also, data showed that Sinai 1 had the higher seed yield / feddan, crude protein, phosphorus and potassium seed contents (kg / fed) than the other four varieties, whereas Giza 51 and Giza 4 have the lowest values. Repeated spray of neem oil 5% or Dithane M 45 three times significantly increased the above four parameters over the check treatment. | ||
| Keywords | ||
| Lentil; Varieties; Neem oil; Gray mold; Alluvial soil; Protein; Potassium; Phosphorus | ||
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