Cotton Leaf Disease Detection by Feature Extraction

Cotton Leaf Disease Detection by Feature Extraction

Savita N. Ghaiwat (GHRCEM, India) and Parul Arora (GHRCEM, India)
DOI: 10.4018/978-1-4666-8737-0.ch005
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Abstract

Cotton leaf diseases have occurred all over the world, including India. They adversely affect cotton quality and yield. Technology can help in identifying disease in early stage so that effective treatment can be given immediately. Now, the control methods rely mainly on artificial means. This paper propose application of image processing and machine learning in identifying three cotton leaf diseases through feature extraction. Using image processing, 12 types of features are extracted from cotton leaf image then the pattern was learned using BP Neural Network method in machine learning process. Three diseases have been diagnosed, namely Powdery mildew, Downy mildew and leafminer. The Neural Network classification performs well and could successfully detect and classify the tested disease.
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2. Cotton Leaf Diseases

In this paper the leaf diseases considered are Powdery mildew, Downy mildew and leafminer. The symptoms of these diseases are as:

Powdery mildew is a fungal disease that affects a wide range of plants. As shown in fig 1.above infected plants display white powdery spots on the leaves and stems. The lower leaves are the most affected, but the mildew can appear on any above-ground part of the plant. Affected leaves eventually turn yellow, then brown. Although not fatal to plants, powdery mildew makes the leaves unattractive and will gradually weaken the plant.

Figure 1.

Image of cotton leaf infected with Powdery Mildew

Reproduction

Powdery mildew fungi reproduce both sexually and asexually. Sexual reproduction is via chasmothecia (formerly cleistothecium), a type of ascocarp. Within each ascocarp are several asci. Over time, ascospores mature and are released to initiate new infections. Conditions necessary for spore maturation differ among species

Vectors of Transmission

Wooly aphids (Eriosomatinae) and other sucking insects are often vectors of transmission for Powdery mildew, and other infectious diseases. Typically wooly aphids in sub temperate climates precede and are an indicator of various infections, including Powdery mildew. Aphids penetrate plant surfaces where they often reside and provide a host of potential inoculants through physical, digestive or fecal secretions. Aphids are often an indicator of other potential plant problems.

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