Methods for protecting vegetables, turfgrass, rice and fruit trees from fungi and bacteria

• US 5,374,627 A
• Filed: 01/19/1993
• Issued: 12/20/1994
• Est. Priority Date: 09/21/1990
• Status: Expired due to Fees

• Current Assignee: Nakano Vinegar Co., Ltd.
• Original Assignee: Nakano Vinegar Co., Ltd.
• Inventors: Ito, Kazuhiro, Entani, Etsuzo, Kawamura, Yoshiya
• Primary Examiner(s): Russel, Jeffrey E.
• Assistant Examiner(s): Leary, Louise N.
• Application Number:
  US08/006,145
• Time in Patent Office: 700 Days
• Field of Search: 514/55, 514/777, 426/49, 426/52, 426/635, 426/655, 426/69, 47/57.6, 56/13.5, 504/100, 504/101
• US Class Current: 514/55
• CPC Class Codes: A01N 37/02 Saturated carboxylic acids or thio analogues thereof; Derivatives thereof
• CPC Class Codes: A01N 43/16 with oxygen as the ring hetero atom
• CPC Class Codes: A01N 63/50 Isolated enzymes; Isolated proteins peptides A01N37/46
• CPC Class Codes: A01N 65/20 Fabaceae or Leguminosae [Pea or Legume family], e.g. pea, lentil, soybean, clover, acacia, honey locust, derris or millettia

Abstract

A variety of plant diseases and damage by certain pests in agricultural and horticultural plants can be efficiently controlled without substantial chemical injuries by applying a plant-protecting composition which comprises (a) 1 part by weight of a chitosan hydrolyzate having an average molecular weight of 10,000 to 50,000, obtained by acid hydrolysis or enzymatic hydrolysis of chitosan and (b) 0.25 to 4 parts by weight of acetic acid. Any possible chemical injury to plants caused by applying the composition can be further reduced when the composition is admixed with a deproteinized juice of alfalfa leaves.

Claims

1. A method for protecting vegetables against bacterial soft rot which comprises applying to the vegetables or to a field thereof an effective protecting amount of a plant-protecting composition consisting essentially of (a) 0.0036 to 0.029% by weight of chitosan hydrolyzate having an average molecular weight from 10,000 to 50,000 and (b) 0.002 to 0.018% by weight of acetic acid, the chitosan hydrolyzate and the acetic acid being in a weight ratio of 1:

0.25 to 1;

4.

2. The method as claimed in claim 1, wherein the composition further contains (c) a deproteinized juice of alfalfa leaves.

3. The method as claimed in claim 2, wherein the deproteinized juice of alfalfa leaves is in an amount from 2 to 20% by weight based on the amount of the composition.

4. A method for protecting turfgrass against spring deadspot, which comprises applying to the turfgrass an effective protecting amount of a plant-protecting composition consisting essentially of (a) 0.0097 to 0.29% by weight of chitosan hydrolyzate having an average molecular weight from 10,000 to 50,000 and (b) 0.0061 to 0.18% by weight of acetic acid, the chitosan hydrolyzate and the acetic acid being in a weight ratio of 1:

0.43 to 1;

2.3.

5. The method as claimed in claim 4, wherein the composition further contains (c) a deproteinized juice of alfalfa leaves.

6. The method as claimed in claim 5, wherein the deproteinized juice of alfalfa leaves is in an amount from 2 to 20% by weight based on the amount of the composition.

7. A method for protecting rice against bacterial grain rot which comprises applying to the rice or to a field thereof an effective protecting amount of a plant-protecting composition consisting essentially of (a) 0.01 to 0.2% by weight of chitosan hydrolyzate having an average molecular weight from 10,000 to 50,000 and (b) 0.01 to 0.2% by weight of acetic acid, the chitosan hydrolyzate and the acetic acid being in a weight ratio of 1:

0.43 to 1;

2.3.

8. The method as claimed in claim 7, wherein the composition further contains (c) a deproteinized juice of alfalfa leaves.

9. The method as claimed in claim 8, wherein the deproteinized juice of alfalfa leaves is in an amount from 2 to 20% by weight based on the amount of the composition.

10. A method for protecting a fruit tree against scab which comprises applying to the fruit tree or to a field thereof an effective protecting amount of a plant-protecting composition consisting essentially of (a) 0.0098 to 0.098% by weight of chitosan hydrolyzate having an average molecular weight from 10,000 to 50,000 and (b) 0.0145 to 0.145% by weight of acetic acid, the chitosan hydrolyzate and the acetic acid being in a weight ratio of 1:

0.25 to 1;

4.

11. The method as claimed in claim 10, wherein the composition further contains (c) a deproteinized juice of alfalfa leaves.

12. The method as claimed in claim 11, wherein the deproteinized juice of alfalfa leaves is in an amount from 2 to 20% by weight based on the amount of the composition.

13. A method for protecting turfgrass against Rhizoctonia large patch or Rhizoctonia brown patch which comprises applying to the turfgrass an effective protecting amount of a plant-protecting composition consisting essentially of (a) 0.0097 to 0.29% by weight of chitosan hydrolyzate having an average molecular weight from 10,000 to 50,000 and (b) 0.0061 to 0.18% by weight of acetic acid, the chitosan hydrolyzate and the acetic acid being in a weight ratio of 1:

0.43 to 1;

2.3.

14. The method as claimed in claim 13, wherein the composition further contains (c) a deproteinized juice of alfalfa leaves.

15. The method as claimed in claim 14, wherein the deproteinized juice of alfalfa leaves is in amount from 2 to 20% by weight based on the amount of the composition.

16. A method for protecting turfgrass against Helminthosporium leaf blight which comprises applying to the turfgrass an effective protecting amount of a plant-protecting composition consisting essentially of (a) 0.0097 to 0.29% by weight of chitosan hydrolyzate having an average molecular weight from 10,000 to 50,000 and (b) 0.0061 to 0.18% by weight of acetic acid, the chitosan hydrolyzate and the acetic acid being in a weight ratio of 1:

0.25 to 1;

4.

17. The method a claimed in claim 16, wherein the composition further contains (c) a deproteinized juice of alfalfa leaves.

18. The method as claimed in claim 17, wherein the deproteinized juice of alfalfa leaves is in amount from 2 to 20% by weight based on the amount of the composition.