The relationship between the efficacy of wheat aphids control and omethoate concentration and droplets density was very closed. Based on regression analysis, laboratory studies showed that LN 90 values were 336.1, 237.6, 208.8 and 115.3 cm -2 respectively, at the omethoate concentration of 1.0, 1.5, 2.0, 3.0 g·L -1 and droplets with 85 μm VMD.

The relationship between the efficacy of wheat aphids control and omethoate concentration and droplets density was very closed. Based on regression analysis, laboratory studies showed that LN 90 values were 336.1, 237.6, 208.8 and 115.3 cm -2 respectively, at the omethoate concentration of 1.0, 1.5, 2.0, 3.0 g·L -1 and droplets with 85 μm VMD.

The first cumulant and time evolution of the droplet density correlation function can be quantitatively calculated by assuming the existence of polydispersed fractal clusters formed by the microemulsion droplets due to attraction.

Furthermore, if the ions can enter the droplet, a first-order phase transition occurs upon increasing Bjerrum length, surface tension or droplet density, leading to a phase separation.

The films are mainly crystallized in the austenitic phase and they have a smooth surface with a low droplet density (0.01?μm-2).

The liquid phase is described in Lagrangian form by the overall continuity equation, which reduces to an equation for the droplet size, the equations of motion, the energy equation and a droplet density function transport equation.

The conservation equations of mass, momentum, solute, and enthalpy for both phases, and an additional transport equation for the droplet density, were solved.

Observations about the distribution habits of the tea caterpillar were conducted in Nangzheng County of Shaanxi Province. The results showed that the larvae before 4th instar distributed regularly on the under surface of the leaves in the middle and lower part of the bilateral tea rows, and the vertical and horizontal movements of the larvae keep relatively stable within the mentioned area within about 20 days. A quick sdraying technique of lateral canopy surface treatment was thus designed for the caterpillar...

Observations about the distribution habits of the tea caterpillar were conducted in Nangzheng County of Shaanxi Province. The results showed that the larvae before 4th instar distributed regularly on the under surface of the leaves in the middle and lower part of the bilateral tea rows, and the vertical and horizontal movements of the larvae keep relatively stable within the mentioned area within about 20 days. A quick sdraying technique of lateral canopy surface treatment was thus designed for the caterpillar control. The spray cloud was introduced directly onto the limited mentioned area, instead of. the conventional whole plant spray. Application rates and deposition densities of spray droplets of 5 insecticides used were determined and the control efficacies reported. Only one fourth of the conventional application dosage of pesticide was enough for control by the application techniques here described, and the pesticide-contamination of bud-tea could be decreased obviously.

The drift of droplets in spraying diluted 2,4-D butyl ester emulsion by Yun-5 aircraft mounted the GP-81 nozzle has been studied,and a mathematical model has also been set up in this paper. As results,the droplet drift distance is 340 meters for the water with the smaller volatility,and 700 meters for the 2,4-D butyl ester with the greater volatility ; the density and amount of droplets decrease rapidly but the diameter decreases smoothly with the distance downwind increasing;the weather conditions and spray...

The drift of droplets in spraying diluted 2,4-D butyl ester emulsion by Yun-5 aircraft mounted the GP-81 nozzle has been studied,and a mathematical model has also been set up in this paper. As results,the droplet drift distance is 340 meters for the water with the smaller volatility,and 700 meters for the 2,4-D butyl ester with the greater volatility ; the density and amount of droplets decrease rapidly but the diameter decreases smoothly with the distance downwind increasing;the weather conditions and spray liquid fomulations influence greatly the drift;the equation Y=b0+b1X+b2X2+b3X3 describles the relation between the droplet drift and the distance downwind well,and the coefficients in the model have a clear practical meaning. This paper also advances an effective buffer zone width in 2,4-D butyl ester aerial application.

Techniques for applying oil formulations of Beauveria bassiana based with afood oil were studied.Conidia lost their viability completely 72 h after being diluted in,No.0 diesel,and so the diesel must be used only as a tank diluent.With a hot frog sprayer(JIN- MA)(nozzle temperature>340℃),almost all conidia sprayed lost their viability.However,with a 3 WCD-5ULV-sprayer,the viability were not affected,and mean diameter ofdroplets was around 30μm.With 12 droplets/cm2 as the effective spraying density,effectivespray...

Techniques for applying oil formulations of Beauveria bassiana based with afood oil were studied.Conidia lost their viability completely 72 h after being diluted in,No.0 diesel,and so the diesel must be used only as a tank diluent.With a hot frog sprayer(JIN- MA)(nozzle temperature>340℃),almost all conidia sprayed lost their viability.However,with a 3 WCD-5ULV-sprayer,the viability were not affected,and mean diameter ofdroplets was around 30μm.With 12 droplets/cm2 as the effective spraying density,effectivespray width could reach 7 m under wind speed of 3 m/s.