The effect of paclobutrazol on the growth of strawberry
Paclobutrazol is a triazole plant growth retardant, which can inhibit the biosynthesis of gibberellin in plants, increase the release of ethylene, delay the division and elongation of plant cells, shorten the internodes, thicken the stems, and make the plants dwarf and compact; It can promote flower bud differentiation, preserve flowers and preserve fruit. Nowadays, paclobutrazol is mainly used to control prosthetic seedlings, but what you don't know is that paclobutrazol can prevent anthrax disease!
I. Effect of paclobutrazol on the growth of strawberry seedlings
Spraying different concentrations of paclobutrazol at different times inhibited the stemping and seedling growth of strawberry stalks.
The earlier the spray time, the higher the concentration used, the more severe the control of strawberry stem and shoot growth.
Mainly in the 3d after spraying, the color of the leaves gradually turns deeper, the leaves are thicker, the petiole becomes harder, and the heart leaves are dwarfed. The middle and late stages of the stolons are shortened with different degrees, the concentration is high and the diameter is shortened, and the concentration is low. Shorter.
Second, the link between paclobutrazol and anthrax
1. The effect of paclobutrazol on anthrax
Seeing different concentrations of treatment have certain control effects on strawberry seedling anthracnose, and the average relative control effect increases slightly with the increase of treatment concentration.
2. Analysis of the causes of prevention of anthrax
The pathogen of anthracnose easily invades from the young parts of the plant, but paclobutrazol makes the strawberry plant shorter, the petiole shortens, the root system is developed, the thickness of the leaf is increased, and the leaf color is deepened, which promotes the plant's short stature and health. From this perspective, it is increased. Resistance to disease; studies have shown that paclobutrazol can induce cell wall thickening near the fruit wound, which is also a manifestation of enhanced stress resistance.
Third, the stem is not good, use paclobutrazol cautiously
When the concentration of 225mgkg-1 was sprayed within 30 days, the stolons no longer occurred. The stolons no longer occurred within 20 days of spraying 150mgkg-1, and the stolons were still sprayed at the concentration of 75mgkg-1, but the number of stems was also reduced. (about 4,500 times dilution)
The seedlings with the concentration of 225mgkg-1 were dwarfed, and the normal growth began gradually after 30 days of spraying. The heart leaves turned tender and tall. The dwarf shrinkage of 150mgkg-1 concentration was moderate, and normal growth began to be started 20d after spraying. Spraying 75mgkg-1 The dwarf concentration is not obvious, and there is a slight inhibition of growth.
Regardless of the high concentration of paclobutrazol, growth will resume after 30 days of spraying. When the 225mgkg-1 concentration is sprayed twice, the plants will not resume growth in the later stage, and the stolons will not be drawn, and the seedlings will be dwarfed.
4. How to save the paxazole excess?
Under normal circumstances, paclobutrazol is not easy to produce phytotoxicity. If the phytotoxicity is caused, if the dosage is too high, the seedlings are inhibited excessively, and nitrogen fertilizer or gibberellin can be added to save.
5. When do you use paclobutrazol?
Strawberry anthracnose is a high-temperature disease that begins to occur from late June to early July, and it erupts after the rain in the hot season.
So try to get the basic seedlings before the onset of high temperature. Spray paclobutraz in time, spray twice with 150mgkg-1 concentration.
It is useful to control the anthrax and the seedlings when the stalks are filled to 80% of the nursery.
Six, paclobutrazol considerations
The growth potential of different strawberry varieties is different. It is recommended that the varieties with strong growth potential be used more, and the weaker ones may be used less or not.
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