AU2020104077A4

AU2020104077A4 - Method for removing diseased leaves and regulating ornamental period of aceraceae plant

Info

Publication number: AU2020104077A4
Application number: AU2020104077A
Authority: AU
Inventors: Longmei DING; Chengxiang HE; Feihong Li; Yang Li; Jianhua Ma; Xianglan SHEN; Xiaohui Wang; Mingjian XIANG; Xiaoxia Yang
Original assignee: Sichuan Colorlink Co Ltd
Current assignee: Sichuan Colorlink Co Ltd
Priority date: 2020-09-04
Filing date: 2020-12-14
Publication date: 2021-02-25
Anticipated expiration: 2028-12-14
Also published as: CN111990105A

Abstract

METHOD FOR REMOVING DISEASED LEAVES AND REGULATING ORNAMENTAL PERIOD OF ACERACEAE PLANT ABSTRACT A method for removing diseased leaves and regulating ornamental period of an Aceraceae plant, the method includes: Si: irrigating an Aceraceae plant for 2 consecutive weeks before spraying a defoliant until the end of ornamental period of the plant; S2: mixing an ethephon stock solution and a thidiazuron stock solution thereby yielding a defoliant comprising 2000 ppm ethephon and 1000 ppm thidiazuron; S3: evenly spraying the defoliant on front and back sides of leaves of the Aceraceae plant in a morning without rain and wind until small drops drip from the leaves; S4: in the next day, spraying potassium dihydrogen phosphate on the leaves of the Aceraceae plant once every three days for three times; and S5: after the leaves fall off and new leaves begin to germinate, spraying an exogenous sugar once every 3 days on the new leaves for 2 times. 11 1/2 FIG. 1

Description

1/2

FIG. 1

METHOD FOR REMOVING DISEASED LEAVES AND REGULATING ORNAMENTAL PERIOD OF ACERACEAE PLANT TECHNICAL FIELD

[0001] The disclosure relates to the field of regulation of plant growth, and more particularly a method for removing diseased leaves and regulating ornamental period of an Aceraceae plant.

BACKGROUND

[0002] Plants of Genus Acer from family Aceraceae is generally called Acer, and it is also known as "Maple". There are more than 200 species of Acer all over the world, which are distributed in Asia, Europe, North America and North Africa, among which, more than 160 species widely distributed in China, accounting for more than 75% of the total number in the world. Acer can be used as building material, papermaking raw material, drug extraction, industrial oil and nectar plant. Some Acer trees have a variety of shapes, natural and unrestrained posture, and are rich in leaf shape and variable in leaf color. Thus, Acer trees are known as world-famous foliage plants.

[0003] Many Aceraceae plants are not tolerant to strong sunlight, and their leaves are vulnerable to strong sunlight in summer, which greatly affects their ornamental value. In garden application and production, the diseased leaves and other normal leaves burned by sunlight are removed manually. After the new leaves sprout and grow, people can enjoy the beautiful shape and rich color of leaves. For example, Chinese Patent Publication No. 101473751A discloses a method of promoting the growth of buds and fresh leaves of Ulmus pumilajinye'. The method includes manually picking up the old or diseased leaves. However, manual removal of leaves is time-consuming, laborious, and inefficient, and has potential risks because picking leaves on the higher positions of a tree requires the gardeners to set up a ladder to climb up the tree.

SUMMARY

[0004] The disclosure provides a method for removing diseased leaves and regulating ornamental period of an Aceraceae plant. The method involves no hand-picking of the old leaves.

[0005] Specifically, the method for removing diseased leaves and regulating ornamental period of an Aceraceae plant comprises:

[0006] SI: water management: irrigating anAceraceae plant for 2 consecutive weeks before spraying a defoliant until the end of ornamental period of the plant;

[0007] S2: preparation of defoliant: mixing an ethephon stock solution and a thidiazuron stock solution thereby yielding a defoliant comprising 2000 ppm ethephon and 1000 ppm thidiazuron, and storing the defoliant in a sprayer;

[0008] S3: spraying defoliant: evenly spraying the defoliant on front and back sides of leaves of the Aceraceae plant in a morning without rain and wind until small drops drip from the leaves;

[0009] S4: spraying potassium dihydrogen phosphate: in the next day, spraying potassium dihydrogen phosphate on the leaves of the Aceraceae plant once every three days for three times; and

[0010] S5: spraying exogenous sugar: after the leaves falloff and new leaves begin to germinate, spraying an exogenous sugar once every 3 days on the new leaves for 2 times.

[0011] Ina class of this embodiment, in SI, a relative water content of a soil where the Aceraceae plant grow is 60-80%.

[0012] Ina class of this embodiment, in S2, the ethephon stock solution with concentration of 4000 ppm and the thidiazuron stock solution of 2000 ppm are prepared with an ethephon aqueous solution and thidiazuron powders, respectively; and the ethephon stock solution and the thidiazuron stock solution in equal volumes are mixed to yield the defoliant.

[0013] Ina class of this embodiment, the ethephon stock solution is prepared by diluting the ethephon aqueous solution with water.

[0014] Ina class of this embodiment, containers for preparing the ethephon stock solution and the defoliant and the sprayer for spraying the defoliant are washed in advance for 3-5 times.

[0015] Ina class of this embodiment, the distance between a nozzle of the sprayer and the leaves is 20-30 cm upon spraying the defoliant, potassium dihydrogen phosphate or exogenous sugar on the leaves.

[0016] Ina class of this embodiment, the potassium dihydrogen phosphate has a concentration of 10000 ppm.

[0017] Ina class of this embodiment, the exogenous sugar has a concentration of 1000 ppm.

[0018] The following advantages are associated with the method of the disclosure:

[0019] The disclosure adopts a mixture of ethephon and thidiazuron as a defoliant to spray the leaves so as to make the leaves fall off rapidly, promote the growth of new leaves, and the defoliation rate is basically above 96%. Through reasonable irrigation and spraying of potassium dihydrogen phosphate and exogenous sugar, the synthesis of anthocyanins is promoted, which is conducive to the performance of leaf color, and thus, the ornamental period of the plant was controlled artificially. In the preparation process, ethephon is diluted twice, thus preventing the decomposition of ethephon.

[0020] The method can be implemented regardless of the season, and can recover the leaf shape of Aceraceae plants so as to present the ornamental period thereof in spring, summer and autumn. It is a large-scale, efficient and convenient method with strong operability and wide application time to remove diseased leaves and regulate the ornamental period. The method has the advantages of high efficiency and convenience, saving labor cost, simple operation and avoiding the hidden danger of manually removing the leaves. The operation speed is fast, the operation can be performed at the same time in different fields, and the consistency of the removal of the leaves is high. As a comparison, in the same plot, some leaves and petioles are removed manually without the use of defoliant. Continuous observation found that compared with the manual removal of the leaves, the germination time of new leaves of the disclosure could be advanced by more than 5 days after spraying the defoliant with ethephon having a concentration of 2000 ppm and thidiazuron having a concentration of 1000 ppm.

BRIEF DESCRIPTION OF THE DRAWINGS

[0021] FIG. 1 is a schematic diagram of an Aceraceae plant 20 days later after being sprayed with a defoliant according to Example 1 of the disclosure; and

[0022] FIG. 2 is a schematic diagram of an Aceraceae plant with new leaves 25 days later after being sprayed with a defoliant according to Example 1 of the disclosure.

DETAILED DESCRIPTION

[0023] To further illustrate the disclosure, embodiments detailing a method for removing diseased leaves and regulating ornamental period of an Aceraceae plant are described below. It should be noted that the following embodiments are intended to describe and not to limit the disclosure.

Example 1

[0024] A method for removing diseased leaves and regulating ornamental period of an Aceraceae plant is implemented as follows:

[0025] SI: Water management: anAceraceae plant was irrigated for 2 consecutive weeks before being sprayed with a defoliant until the end of ornamental period of the plant; the relative water content of the soil where the Aceraceae plant grew was -80%. From July to September 2019, the leaf color control experiment of Aceraceae showed that reasonable irrigation was beneficial to anthocyanin synthesis and leaf color performance.

[0026] S2: Preparation of defoliant: ethephon is an acidic pesticide and easy to decompose when pH is greater than 4. Therefore, the containers for preparing the ethephon stock solution and the defoliant and a sprayer for storing the defoliant were cleaned 3-5 times in advance.

[0027] In view of the strong acidity of ethephon and weak basicity of thidiazuron, the ethephon stock solution with concentration of 4000 ppm and the thidiazuron stock solution of 2000 ppm were prepared with an ethephon aqueous solution and thidiazuron powders, respectively, and then the ethephon stock solution and the thidiazuron stock solution in equal volumes were mixed to yield the defoliant. The defoliant was stored in the sprayer. Specifically, the ethephon stock solution was prepared by diluting the ethephon aqueous solution with water, so as to prevent the decomposition of ethephon due to high pH.

[0028] S3: spraying defoliant: the defoliant was evenly sprayed on the front and back sides of leaves of the Aceraceae plant in a morning without rain and wind. The distance between the nozzle of the sprayer and the leaves was 20-30 cm upon spraying the defoliant. Each leaf was evenly sprayed with the defoliant until small drops dripped from the leaves.

[0029] S4: spraying potassium dihydrogen phosphate: in the next day, potassium dihydrogen phosphate was sprayed on the front and back sides of the leaves of the Aceraceae plant once every three days for three times. The distance between the nozzle of the sprayer and the leaves was 20-30 cm upon spraying the potassium dihydrogen phosphate. Each leaf was evenly sprayed with the potassium dihydrogen phosphate until small drops dripped from the leaves.

[0030] S5: spraying exogenous sugar: after the leaves fell off and new leaves began to germinate, an exogenous sugar was sprayed once every 3 days on the front and back sides of the new leaves for 2 times. The distance between the nozzle of the sprayer and the leaves was 20-30 cm upon spraying the exogenous sugar. Each leaf was evenly sprayed with the exogenous sugar until small drops dripped from the leaves.

[0031] The method for removing diseased leaves and regulating ornamental period of an Aceraceae plant can be applied to a variety of Aceraceae plants, such as Acer palmatum'Sangokaku', Acerpalmatum'Seiryu',AcerpalmatumThunb, Acer palmatum'Atropurpureum', Acerpalmatum'Katsurai',etc. TheAceraceae plant in this example is Acerpalmatum 'Sango kaku'. After being sprayed with the defoliant, the leaves of Aceraceae plant fell off completely after 20 days, as shown in FIG. 1; the new leaves germinated after 25 days, as shown in FIG. 2, and the leaves stretched out and entered the ornamental period after 5-7 days of germination. Therefore, the method of the disclosure is helpful for the rapid and orderly shedding of the leaves of Aceraceae Plants and plays a role in regulating the ornamental period of the plants.

Example 2

[0032] Different defoliants with different concentrations were applied to the leaves of Chinese red maple, and then potassium dihydrogen phosphate and exogenous sugar were sprayed as descried in Example 1. 30 days later, the falling of the old leaves and the germination of the new leaves were recorded.

Table 1 Effect of different defoliants with different concentrations on falling of leaves of Acerpalmatum 'Atropurpureum'

Agents and Totalnumberof Number of Leaf abscission concentrations leaves (prior to green leaves rate spraying defoliant) Glyphosate 410 ppm 586 456 0.221843003 Glyphosate 820 ppm 354 274 0.225988701 Glyphosate 1640 ppm 462 132 0.714285714 Ethephon 400 ppm 354 292 0.175141243 Ethephon 800 ppm 410 216 0.473170732 Ethephon 1600 ppm 446 175 0.607623318 Abscisic acid 1000ppm 840 497 0.408333333 Abscisic acid 2000ppm 416 382 0.081730769 Abscisic acid 4000ppm 790 538 0.318987342 CK 0 0

[0033] As shown in Table 1,1640 ppm glyphosate had the best defoliation effect, followed by ethephon. However, subsequent tests found that the defoliation principle of glyphosate was similar to that of herbicides. Touching leaves would have harmful effects on the trees themselves, leading to poor effect of germination of new leaves, so glyphosate was ruled out. The defoliation rate of 1600 ppm ethephon was 60.76%. In view of the germination of new leaves, the comprehensive effect of ethephon was the best.

Example 3

[0034] Different defoliants with different concentrations were applied to the leaves of Aceraceae plants, and then potassium dihydrogen phosphate and exogenous sugar were sprayed as descried in Example 1. 30 days later, the falling of the old leaves and the germination of the new leaves were recorded.

Table 2 Effect of different defoliants with different concentrations on falling of leaves of Acerpalmatum 'Katsurai'

Time Remained Leaf when the Total Ethephon number leaves abscission new No. Thidiazuron (ppm) (ppm) ofleaves after rate leaves treatment begin to germinate 1 0 1000 76 33 56.58% 31D 2 0 2000 167 2 98.80% 31D 3 1000 0 72 55 23.61% 23D 4 1000 1000 308 67 78.25% 22D 5 1000 2000 88 1 98.86% 23D 6 500 0 82 65 20.73% 28D 7 500 1000 70 46 34.29% 29D 8 500 2000 46 2 95.65% 29D

Table 3 Effect of different defoliants with different concentrations on falling of leaves of Acerpalmatum 'Seiryu'

Time Remained Leaf when the Total Ethephon number leaves abscission new No. Thidiazuron (ppm) (ppm) ofleaves after rate leaves treatment begin to germinate 1 0 0 279 253 9.32% 31D 2 0 1000 44 9 79.55% 30D 3 0 2000 104 3 97.12% 30D 4 1000 0 314 303 3.50% 22D 5 1000 1000 72 3 95.83% 21D 6 1000 2000 85 1 98.82% 21D 7 500 0 56 46 17.86% 26D

8 500 1000 76 33 56.58% 26D 9 500 2000 87 13 85.06% 27D

Table 4 Effect of different defoliants with different concentrations on falling of leaves of Acerpalmatum 'Sango kaku'

Remained Leaf Time when Total Thidiazuron Ethephon the new No. (ppm) (pm) number of leaves after abscission lee (ppm) (ppm) leaves treatment rate leaves begin to germinate 1 0 0 27 24 11.11% 30D 2 0 1000 51 36 29.41% 30D 3 0 2000 30 2 93.33% 30D 4 1000 0 110 106 3.64% 28D 5 1000 1000 60 29 51.67% 26D 6 1000 2000 56 2 96.43% 25D 7 500 0 43 38 11.63% 29D 8 500 1000 65 31 52.31% 28D 9 500 2000 18 3 83.33% 29D

[0035] As shown in Table 3 and 4, ethephon alone can increase the leaf abscission rate of Aceraceae plants, while thidiazuron alone can reduce the leaf abscission rate of Aceraceae plants. The composite defoliation agent of ethephon and thidiazuron can effectively improve the leaf abscission rate. When the concentration of ethephon was 2000 ppm and the concentration of thidiazuron was 1000 ppm, the leaf abscission rate achieved more than 96%. The germination time of new leaves was advanced about 10 days, and the regularity of new leaves sprouting was strengthened, which played an active role in regulating the ornamental period of plant leaves.

[0036] It will be obvious to those skilled in the art that changes and modifications may be made, and therefore, the aim in the appended claims is to cover all such changes and modifications.

Claims

METHOD FOR REMOVING DISEASED LEAVES AND REGULATING ORNAMENTAL PERIOD OF ACERACEAE PLANT

A method for removing diseased leaves and regulating ornamental period of an

Aceraceae plant, the method comprising:

Sl: water management: irrigating an Aceraceae plant for 2 consecutive weeks before spraying a defoliant until the end of ornamental period of the plant;

S2: preparation of defoliant: mixing an ethephon stock solution and a thidiazuron stock solution thereby yielding a defoliant comprising 2000 ppm ethephon and 1000 ppm thidiazuron, and storing the defoliant in a sprayer;

S3: spraying defoliant: evenly spraying the defoliant on front and back sides of leaves of the Aceraceae plant in a morning without rain and wind until small drops drip from the leaves;

S4: spraying potassium dihydrogen phosphate: in the next day, spraying potassium dihydrogen phosphate on the leaves of the Aceraceae plant once every three days for three times; and

S5: spraying exogenous sugar: after the leaves fall off and new leaves begin to germinate, spraying an exogenous sugar once every 3 days on the new leaves for 2 times.
2. The method of claim 1, wherein in Sl, a relative water content of a soil where

the Aceraceae plant grow is 60-80%.
3. The method of claim 1, wherein in S2, the ethephon stock solution with

concentration of 4000 ppm and the thidiazuron stock solution of 2000 ppm are

prepared with an ethephon aqueous solution and thidiazuron powders,

respectively; and the ethephon stock solution and the thidiazuron stock

solution in equal volumes are mixed to yield the defoliant.
4. The method of claim 3, wherein the ethephon stock solution is prepared by

diluting the ethephon aqueous solution with water.
5. The method of claim 1 or 3, wherein containers for preparing the ethephon

stock solution and the defoliant and the sprayer for spraying the defoliant are

washed in advance for 3-5 times.
6. The method of claim 1, wherein a distance between a nozzle of the sprayer and

the leaves is 20-30 cm upon spraying the defoliant, potassium dihydrogen

phosphate or exogenous sugar on the leaves.
7. The method of claim 1, wherein the potassium dihydrogen phosphate has a

concentration of 10000 ppm.
8. The method of claim 1, wherein the exogenous sugar has a concentration of

1000 ppm.