80 CONTENTS 13.1 Introduction 13.2 Eucalyptus diseases (gum) 13.3 Acacia diseases (wattle) 13.4 Pinus diseases (pine) 13.1 Introduction This chapter deals only with the major diseases of commercial forestry trees in South Africa.0 CONTENTS 13.1 Introduction 13.2 Eucalyptus diseases (gum) 13.3 Acacia diseases (wattle) 13.4 Pinus diseases (pine) 13.1 Introduction This chapter deals only with the major diseases of commercial forestry trees in South Africa.
The pigment responsible for most light-harvesting by plants is chlorophyll, a green pigment. The green color indicates that it is absorbing all the non-green light-- the blues (~425-450 nm), the reds and yellows (600-700 nm).
Colors. Chlorophyll a is a blue-green color, and chlorophyll B is a yellow-green color. This is what causes the wide variety of difference in plant colors. As plants develop different ratios of the chlorophylls, they may absorb different waves of light for photosynthesis, which makes different colors emerge.hlorophyll is also the substance that gives plants its green pigment because of its inability to absorb green light waves. Oregon State University says that 25 different chlorophyll pigments exist, the most common chlorophyll A and chlorophyll B. While two of the most common pigments, they have subtle differences.