122 Papaya
region of the stem is susceptible to infection during rainy periods and causes stem
canker like appearance. The infected plant may become more susceptible to wind
damage (Hunter and Kunimoto 1974). Older portions of stems are susceptible when
wet after extended rainfall/injury. Foliage on affected stems may collapse. Lateral
roots of young plants are most susceptible in poorly drained soils. Roots may become
dark and rotten, causing stunting of plant growth and leaves turn yellow and col-
lapse. Severely infected plants may die. Plants with a heavy load of fruit may topple
(Figure 10.10). Papaya plants with rotten roots become susceptible to drought stress.
10.11.1 Management
Select a well-drained low-rainfall site for cultivation of papaya. Orchard should be
planted in well-drained soil with improved drainage in problematic soils is important
FIGURE 10.9 Leaf damaged by leaf blight disease.
FIGURE 10.10 Papaya field damaged by Phytophthora blight.