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The dry rot pathogens mainly overwintered on the stem and fruit of the tree. The mycelium on the surface of the stiff fruit produced new spores around mid-April of the following year, which was the main pathogen of the disease.
In May of flowering season, dry rot begins to infest. The damaged petals initially turn brown and continue to expand into flower buds and receptacles, turning the entire flower brown. In the brown part, many small dark particles occur, which is the conidia of the pathogen. Branches are infected and the junction between the diseased part and the health part often cracks, and the diseased skin is chapped and even peeled off. After the onset of the disease, the disease department rapidly expanded and reached deep into the xylem, and finally the entire branch was dry and dead. Flowers and young fruit fall off early after serious damage. When the young fruit enlarges to 70%, it will no longer fall off and shrink into a stale fruit and hang on the branch.
The predisposing factors of dry rot include uncontrolled blind wiping of buds, excessive wounds, and weakened tree vigor caused by too large loss of leaf area; over-application of pure nitrogen fertilizer stimulates tree growth; No reasonable sparse blooms and fruiting were conducted.
Therefore, the epidemic period before and after flowering, each spray 1:1.5:160 times Bordeaux mixture, or spray 50% thiophanate-methyl WP 800-1000 times, after every 15-20 days spray once.
After the pomegranate fruit is set, it can be combined with spraying insecticides, adding agricultural anti-120, excellent fruit calcium 600 times liquid spray. Use 1 part of the agricultural anti-120, 2 parts compound amino acid chelating fertilizer, after 30 parts of water, brush the trunk and the main branch.
Pomegranate blossoms against dry rot
Pomegranate dry rot not only infringes the flowers and fruits during growth, but also invades the stored fruits.