Allicin EC against cucumber bacterial angular leaf spot

[Abstract] Field trials showed that 32% oxazolone · allicin EC has a good control effect on cucumber bacterial keratosis. The field treatment dose is 3 to 4 times, the application interval is 7 & mdash; 8 days, for cucumber The control effect of keratosis is between 76% and 79%, and the duration of effect is more than 10 days. It is safe for the tested crops and has the effect of improving yield and quality.

In recent years, with the rapid development of vegetable protection areas around the country, the occurrence of bacterial bacterial leaf spot disease in cucumber has become more and more serious, which often occurs in the early stage of cucumber growth in protected areas and in the middle and late stages of cucumber in the open field, mainly infecting leaves, petioles, stems and melons. It has seriously affected the quality and yield of cucumber fruit and became an important disease of cucumber. With the long-term use of systemic fungicides, some fungicide products have developed resistance. Therefore, it is necessary to screen out effective and safe chemical agents to control cucumber bacterial angular spot disease. Sexual plaque disease agent. Allicin is a broad-spectrum fungicide whose mechanism of action is jL in its molecular structure. A group reacts with a substance containing a SH group in the cell molecule to inhibit the normal metabolism of the cell, and the allicin has a stimulating effect on plant growth, and the crop grows robust after spraying.

1, test materials and methods

1.1 Test agent: 32% oxazolone · allicin emulsifiable concentrate (agrochemicals in Kaifeng); 40% agricultural streptomycin soluble powder (Hua JE Pharmaceutical Ainuo Co., Ltd.); 53.8% Can kill dry suspension (US letter company).

1.2 Test crops: Cucumber cultivar Danfeng No.3.

1.3 Control object: Cucumber bacterial angular leaf spot.

1.4 test treatment: 32% oxazolone · allicin EC 3709 ai, / hm2, 4309 ai / hm2, 4909 ai / hm2; 40% agricultural streptomycin soluble powder 1809 ai / hm2 53.8% can kill dry suspension 6509 ai / hm2.

1.5 Test site and general situation: The experiment is located in the Et light greenhouse on the outskirts of Dandong Wind City. The soil is sandy loam soil with a soil pH of 6.9 and an organic matter content of 3.0%. Sowing the Et period on December 21, the date of colonization on February 4 Et. The plant spacing is 25 cm & time; 80 cm, the plant growth is consistent.

1.6 Test design and investigation, statistical methods: The test was carried out in accordance with the Ministry of Agriculture "Pesticide Field Efficacy Test Guidelines (2)" & lsquo; 1). There are 6 treatments in the experiment, and each treatment is repeated 4 times. Each repetition is set as one cell, a total of 24 cells, and the cells are randomly arranged in groups, with a cell area of ​​15 m 2 , and the cultivation conditions of all the cells are uniform. When the crop is applied, the crop is in the flowering period, and the spray device is a manual sprayer of workers and peasants type 16, and the amount of liquid per (mu) is 45 kg. The first application was made on April 7, and every 7-8 days thereafter, the drug was applied three times. The investigation was conducted before each application and 10 days after the last application. The disease index and the control effect are calculated according to the above Guidelines. The fruit quality of cucumber was determined during the test, and the safety of the drug to cucumber was determined irregularly.

2, Results and Analysis

From the field efficacy test results (see Table 1), it can be seen that the control effect of 32% oxazolone · allicin EC on the bacterial angular leaf spot of cucumber increased with the increase of dosage. The control effects of 4309 and 4909 ai/hmz on cucumber bacterial angular leaf spot were 76.03% and 78.81%, respectively, which were slightly higher than that of the control drug agricultural streptomycin and the killable dry suspension agent. The control effect of 32% oxazolone · the allicin emulsifiable concentrate 3709 a.i./hm2 was slightly lower than that of the control agent. From the test results, it can be seen that 32% oxazolone · allicin EC 430 & mdash; 4909 ai / hm2, 40% agricultural streptomycin soluble powder and 53.8% can kill dry suspension agent treatment have different degrees of cucumber growth The increase in production, the best effect is 4909 ai / hm2, the yield increase is 16.43%, the effect is more obvious.

From the comparison of the main indicators of fruit quality in Table 2, it can be seen that the appearance shape curvature, melon length and transverse diameter are the best, 32% oxazolone · arbutin emulsifiable concentrate 4909a.i./hm2, melon length and The transverse diameter increased by 7.82% and 0.93%, respectively, followed by 40% agricultural streptomycin soluble powder, 32% oxazolone · allicin emulsifiable concentrate 4309 ai/hm2 53.8% could kill dry suspension, 32% azole Ketone & middot; allicin EC{fI|3709 ai/hm2; from the inner quality of the flesh thickness, the best performance is 32% oxazolone · the allicin EC 4909 ai / hm:, an increase of 8.7% over the control, The rest of the treatment was also better than the control.

3, Summary and Discussion

From the field test results, the effective dose of 32% oxazolone · allicin EC for controlling bacterial bacterial leaf spot disease is 430 ~ 4909 ai / hm: in the early stage of bacterial keratosis, spray method Face application, application interval 7. 10 days, medication 3.4 times. In order to prevent the resistance of the bacteria to the fungicide, allicin is recommended to be used alternately with a protective fungicide or a fungicide having a different mechanism of action. The results of field use showed that 32% oxazolone · allicin EC 4909 ai / hm2 has a good control effect on cucumber bacterial angular leaf spot, higher than 40% agricultural streptomycin soluble powder and 53.8% can kill The control effect of the suspension agent. Allicin has a good therapeutic and protective effect on cucumber bacterial angular leaf spot, and can improve the quality of the fruit properly. It can be used as a rotation to prevent the use of single-use fungicide resistance.