Method for controlling of piricularia pitting rice disease

FIELD: plant growing, in particular, rice disease controlling process.

SUBSTANCE: method involves treating rice young crops at milky-wax ripeness phase with carbamide mixture in dose of 20-30 kg/hectare, pherazime SC fungicide in dose of 0.6 kg/hectare, and luvaram containing growth promoter in dose of 22 ml/hectare at mixture flow rate of 100 l/hectare.

EFFECT: increased efficiency in controlling of piricularia pitting rice disease at late development stages and during milky-wax ripeness stage when plant's vegetative and generative organs are simultaneously stricken by disease.

1 tbl, 1 ex

 

The invention relates to the field of agriculture, particularly crop production, and is designed to combat diseases of rice.

A known way of dealing with piricularia rice (see, for example, A.S. No. 11793839, No. 5, 1993), lies in the processing of rice crops in a phase of troublevania 10-20%solution of urea at the rate of 100-120 l/ha

The disadvantage of this method is that the processing of urea is a nitrogen fertilizer, enhance the immune power plants, does not protect against re-defeat fungal diseases in the stage of milky-wax ripeness, when affected leaf blades, their base, leaf sheath, stem nodes and panicles, which leads to loss of yield by 20-30% and more.

A known way of dealing with piricularia rice fungicides (fundazol, and others, see, for example, Recommendations on integrated protection of agricultural crops from pests, diseases and weeds in the Krasnodar region in 2000-2005 year. Krasnodar, 2001, pp.31-37), which is recommended to apply at least 30 days before harvest (phase rice inflorescence emerge - bloom once a season with a consumption rate of 2 kg/ha and the rate of fluid flow 100-120 l/ha

The disadvantage of this method is that it is ineffective when the disease affects all vegetative and generative organs of rice plants at the late vegetative phases (grain swelling).

On the more closest technical solution for this problem is a way of dealing with piricularia, involved in the processing of rice crops in a phase of emergence - flowering (30 days before ripening rice) fungicide Perazim COP at the rate of 0.3-0.8 kg/ha at a rate of flow of the working solution 100-120 l/ha (see, for example, "Supplement to journal "Protection and quarantine of plants No. 4, M, 2003).

The disadvantage of this method is low efficiency in the final stages of development of rice (grain swelling), when piricularia affects leaf blade, stem nodes and panicles, which leads to a significant loss of yield.

The objective of the invention is improving the effectiveness of the fight against piricularia in the later stages of rice development, at the stage of milky-wax ripeness, when struck simultaneously vegetative and generative organs of plants.

The task is accomplished as follows. At the stage of milky-wax ripeness rice use a tank mixture of urea 20-30 kg/ha, fungicide, for example, terazima COP of 0.6 kg/ha and growth stimulator containing 2,4-D (amine salt), for example, novarama in the dose of 22 ml/ha with a consumption rate of 100 l/ha

Amine salt acts as a growth promoter (see, for example, Deambrodio E., Dale J.P.Effecto of 2,4-D on the freguency of regenerated plants in barley and on genetic variability between them. // Cereal Res Commun. 1980, v.8, p.417-423).

The working solution is prepared before processing in the following sequence: tank fill 2/3 of the required amount of water, add the calculated amount of urea (0-30 kg/ha), mix thoroughly, add the right amount of fungicide, for example, terazima (0.6 kg/ha), again mix and add a growth stimulant containing 2,4-D (amine salt), for example, luwaran (22 ml/ha), mixed and the resulting solution is poured into the spray unit (aircraft, helicopter, ground sprayer until the knapsack) and processes affected by fungal disease of the square.

Test method conducted LLC Khit and" Slavic district of Krasnodar Krai in 2003 on crops of rice varieties Leader.

The disease was recorded on August 21, when the rice plants were at the stage of milky-wax ripeness. The disease struck all vegetative and generative organs as a result of prevailing weather conditions (heavy rain, dew, fog).

Felt six options:

1. Control-treatment fungicide dressing; (basic drug, the most common, 2 kg/ha).

2. Treatment with urea at a dose of 20 kg/ha

3. Treatment with the fungicide Perazim at a dose of 0.6 kg/ha (prototype).

4. Treatment with a mixture of drugs: urea 20 kg/ha+Perazim - 0.6 kg/ha+amine salt 2,4-D - 22 ml/ha

5. Treatment with a mixture of drugs: urea 25 kg/ha+Perazim - 0.6 kg/ha+amine salt 2,4-D - 22 ml/ha

6. Treatment with a mixture of drugs: urea - 30 kg/ha +Perazim - 0.6 kg/ha+amine salt 2,4-D - 22 ml/ha

Example. Option 5.

After identifying 21 August amazed piricularia plots of rice crops in the stage of milky-wax ripeness, took into account the percentage of the lesion, then 25 August re accounting and processed crops in tank mixtures of urea, fungicide, for example, terazima COP and growth stimulator containing 2,4-D (amine salt), for example, novarama which was prepared on existing technology. Fill the spray tank 1/3 of the consumption rate of the working fluid was added to the urea at the rate of 25 kg/ha, included a stirrer, was added Perazim COP of 0.6 kg/ha, and then topped up the growth stimulator containing 2,4-D (amine salt), for example, luwaran 22 ml/ha water topped up to full standards and are thoroughly mixed and then processed rice crops. Recent accounting lesions piricularia rice crops held on the day of its harvest September 10.

Other techniques of rice cultivation was carried out according to existing recommendations.

The test results for all variants of the experiment are shown in the table. It can be seen that the percentage of destruction of rice crops by piricularia in the control version was 100%, which recorded a total loss of the crop.

The use of urea in a dose of 20 kg/ha was slightly delayed the development of piricularia, lesions in which cleaning was 85%and the yield of 20.8 kg/ha (option 2). Use the W as a fungicide of terazima (option 3) led to a slowing of the process of destruction of crops disease compared with options 1 and 2. In cleaning option 3 was affected 56% of the cultivated area and yield totaled 32.0 kg/ha

The use of tank mixtures of drugs in versions 4.5 and 6 completely stopped the process of the spread of disease, and the yield was 54,0; 56,0; 54,3 kg/ha respectively with the norms of urea, 20, 25 and 30 kg/ha with the same doses of the fungicide, for example, terazima and growth stimulator containing 2,4-D (amine salt), for example, novarama. Test-known ways of dealing with piricularia 10-15 days before full ripening rice showed their low efficiency.

Table.

The percentage of destruction of rice crops by pyricularia
OptionsThe acreage, hectaresThe days of recordsYield, kg/ha
identifying 21.08processing 25.08cleaning 10.09
1. Control5,7129421000
2. Urea 20 kg/ha4,8627488520,8
3. Fungicide Perazim COP of 0.6 kg/ha6,1227395632,0
Carbamic 20 kg/ha+fungicide, e.g. the measures Perazim 0.6 kg/ha+growth stimulator containing 2,4-D (amine salt), for example, luwaran 22 ml/ha5,4230474954,0
5.-"-25-"-+-"-+-"-6,3532484856,0
6.-"-30-"-+-"-+-"-to 4.6828393954,3

The way to fight piricularia rice, including the processing of rice crops fungicides, characterized in that as a fungicide use Perazim CA in a dose of 0.6 kg/ha in mixture with urea in a dose of 20-30 kg/ha and growth regulator by novarama at a dose of 22 ml/ha at the rate of mixture flow rate 100 l/ha, while the treatment of crops of rice are in the stage of milky-wax ripeness.



 

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