Effect of paper cone shading on preventing apple fruits from sunburn

Experimental study shows that the paper cone shading of fruits in periphery of tree crown can significantly reduce the light reception by 2/3 by fruit,resulting in a decrease of fruit surface temperature(≥7℃).So the sunburn percentage is lowered dramatically.In addition,the paper cone shading should be conducted in mid or late May for the fruit on southwest canopy.In the areas where sunburn app ears frequently,partly or completely shaded fruits should be remained during fruit thinning.