Results the key control methods of kiwifruit canker in orchard

Results the key control methods of kiwifruit canker in orchard

Bacterial canker of kiwifruit is the first major disease in kiwifruit. According to the investigation and experiment in different areas, the key period of chemical control and application scheme of the disease were preliminarily determined for reference.

1 the key period of prevention and control

Kiwifruit canker caused by Pseudomonas aeruginosa in kiwifruit caused by pathogenic variety of kiwifruit (Fig. 1 ~ Fig. 3). After fruit picking, defoliation, winter shearing to pre-sprouting, post-germination to pre-flowering and post-flowering, are the key periods for disease prevention and control.

2 technical methods of prevention and control in different periods

2.1 after fruit harvest

Spray 1.5% (mass fraction, after the same) thiamidone water emulsion 500 times 800 times or 20% thiobacillus copper suspension 600 times, etc., apply once to the whole tree to prevent pathogens from invading from fruit stalks, leaf veins and other parts.

2.2 deciduous stage

Spraying 50% quinoline copper suspension solution 750 times or 46% could kill 3, 000 × 2, 000 times twice to prevent bacteria from infecting from fallen leaves; when possible, 50 μ g / ml BTH was added to the above agents to induce tree resistance.

2.3 after winter shearing to before sprouting

The scissors and scars can be directly smeared with 1.6% thiamidone ointment or 20 times with 2% Chunleimycin water solution + 72% streptomycin 20 times, 1.5% thiamidone water agent or water emulsion 20 times, combined with foot joint and bridging measures. At the same time, before sprouting, the whole garden was sprayed with 3-5-Baomesulphur mixture or 1.8% octylamine 30-fold 50 times or 0.15% tetramycin 500-800 times 2 times, in addition, 2% polysaccharides such as brown sugar, 50 μ g / ml BTH, or mixed with antibiotics could improve the frost resistance of trees at low temperature. Pay attention to heat preservation and anti-freezing measures before and after winter shearing, such as trunk whitening, trunk bandaging (figure 5) [Jishan Huayao], antifreeze treatment, root neck soil, etc., to prevent trees from frost and frost damage. If the disease is serious or highly susceptible, we can appropriately increase the frequency of medication or shorten the interval of medication according to the condition, and clear the garden in time.

2.4 from budding to pre-flowering

Spraying 72% agricultural streptomycin wettable powder 1 000 times + 3% Zhongshengmycin wettable powder 500 times 800 times or 20% copper suspension 600 times + 3% Zhongshengmycin wettable powder 500 times 800 times or 46% could kill 3 thousand times 2 times, including trees, floors, shelves and other comprehensive spray disinfection. At the same time, the inspection continued during this period to cut off the newly diseased tissue.

Fig. 5 main trunk bandaging and anti-freezing

2.5 after anthesis

Spray 50% quinoline copper suspension 750 times + 2% Wuyimycin water agent 200 times once twice to prevent the disease of leaves and vines.