|
|
Studies on the interaction among some fungicides and Certain Pesticides on Tomato Early Blight Disease
|
|
Abstract: Surveying tomato early blight caused by Alternaria solani revealed that the disease was widespread in the inspected seven governorates. Isolation trials from the diseased tomato plants showing early blight symptoms yielded A. solani, A. tennis and A. tomato. Pathogenicity tests of the isolated fungi proved that only A. solani caused typical symptoms of early blight. The disease was decreased by increasing the age of the inoculated plants with A. solani which able to cause the infection at any of the used inoculum concentration. All the tested tomato cultivars were liable to infection with the disease. However, cv. Peto 86 was the most affected one and both cvs. Luxur and E 6203 were the least affected.
The fungus A. solani can grow on the tested semi-synthetic media and, which carrot dextrose agar medium (CDA) was the best one and garlic dextrose agar medium (GDA) was the least favourable one. In addition, the fungus can grow at a wide range of degrees of temperature (ranged from 10 - 40 DC) and
Relative humidity (25 – 100% and with no solution). The tested seven fungicides
As well as the acaricide Ortus and the insecticide Marshal caused different degrees of inhibitory effect on the linear growth of A. solani in vitro experiment.
In addition, Equation followed Bellecute were the most effective fungicides. In
Addition, the tested fungicides were more effective in this concern in comparison with the other two pesticides. Moreover, mixing any of the tested fungicides with both Ortus and Marshal increased the efficiency of the mixtures in comparison with using each alone or Ortus + Marshal. Conidial spores of A. solani can germinate at 5 - 35 °C and 75 - 100 % relative humidity as well as with no solution. Mixing any of the four tested fungicides with both Ortus + Marshal increased the inhibitory effect on the germinated spores in comparison with using each alone 01' Ortus + Marshal.
Field experiment of testing the effect the combination among any of the
Tested fungicides, i.e. Bellecute, Galben copper, Equation and Funguran with
the acaricide Ortus and the insecticide Marshal in controlling tomato early blight was carried out in the field under natural infection during two successive growing season, i.e. 1998 and 1999. Data indicated that the combination among the Previous pesticides were the best treatments in controlling the disease with producing high fruit yield in comparison with spraying of each alone, Ortus + Marshal and colltrol treatment.
|
| Publication year |
2000
|
| Availability location |
7 شارع نادى الصيد - الدقى - الجيزة(المعمل المركزى لتحليل متبقيات المبيدات والعناصر الثقيلة فى الأغذية)
|
| Availability number |
|
| Organization Name |
|
| Country |
Egypt
|
| Department |
Pesticides Residue Analysis
|
| Author(s) from ARC |
|
| Agris Categories |
Plant diseases
|
| Proposed Agrovoc |
Tomatoes--Diseases;Fungal diseases of plants;
|
| Publication Type |
Master Thesis
|