Three systemic fungicides fenarimol, triflumizol, and triadimenol were used (mixed with mineral oil at 300 ml/100 L water or not) to evaluate the effects on powdery mildew of tomato in greenhouse. Results showed important role of mineral oil in inhan
cing the studied fungicides's effects by decreasing infection percentage and severity of the disease if the recommended doses are used or half of them. when these fungicides were used in low rates (50% of the recommended doses without mineral oil) infection percentage after a mounth of treating were 65.2 - 75.7% and severity 62.7 – 77.3% wherease when the fungicides were used with oil the infection percentage were decreased to 44.5 - 48.6% and severity to 16.9 – 45.8%
Hydraulic system was designed and installed to estimate values of Bulk modulus within the range of
pressure between 20 bar to 230 bar and temperature between 5° C to 90° C; these limits are the widest
range in which it operates hydraulic systems .
In this research the mineral oil (SAE 46) is heated
(indirectly method) and then pressed into a pipe with large thickness compared with internal diameter so
as to ensure that the results will not be affected by the elasticity of the pipe material. The results for the
characteristics‚the pressure and temperature have been indicated by gages installed on the line of
hydraulic circuit while taking readings compressibility through indicator tube. It was concluded that the
temperature of mineral oil have an effective impact on the Bulk modulus values even at lower
temperatures lower than 50° C and the sloop (of the relation curve between Bulk modulus and pressure)
is reduced with temperature increase. it was also estimated that values of Bulk modulus are volatileat
pressures less than 100 bar with increasing temperatures for this mineral oil.
To evaluate the effects of summer mineral oil which were mixed with tow systemic commercial fungicides Flint and Trifmine on some tomato yield properties in Syrian coast greenhouse conditions, the tow fungicides were supplied at the recommended doses
(mixed with mineral oil or not), the results showed no negative effctes on the plant flowers, fruits, fruit's weight through the study; there were 71.0-75.0 fruits on each plant and fruit's weight was 75.3-87.2 g/one fruit in treatments which fungicides were not mixed with mineral oil, 69.1-76.4 fruits on each plant, 74.8-81.2 g/one fruit in treatments which fungicides were mixed, compairing with 62.2 fruits/plant in control, 87.6 g/fruit in control, differences were not significant.
