CN113785848A - 一种植物源杀线虫制剂及其制备方法 - Google Patents
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Abstract
本发明公开了一种植物源杀线虫制剂及其制备方法,涉及植物源农药,属于有害生物绿色防控技术领域。一种植物源杀线虫制剂,其原材料组分按重量百分比计,掌叶大黄:3~12%,生物炭:8~12%,有机肥:54~64%,其余为水分。本发明提供的植物源杀线虫制剂,可以有效控制根结线虫对烟草等作物的危害,对作物安全,可有效提升农产品的产量和品质;此外,使用本防治技术根结线虫难以产生抗药性,也不存在药剂残留问题,对环境安全友好,有利于维持农田生态平衡,是一种理想的植物源农药。
Description
技术领域
本发明涉及植物源农药,属于有害生物绿色防控技术领域,具体是一种采用掌叶大黄为主要原料的植物源杀线虫制剂及其制备方法。
背景技术
植物病原线虫是影响植物寿命和生长潜能的重要因子之一。据估计,全世界农作物每年因线虫危害损失约为12%。烟草为我国西南山区的一种重要经济作物,但由于西南山区耕地资源有限,烟草连作问题突出,加之土壤保育措施匮乏,致使烟草根结线虫病等土传病危害较重。根结线虫病属于典型的土传病害,病原习性隐蔽,抗逆性强,生产中极易与缺肥症状混淆而引起误判,与空气、水及种苗等传播途径的病害相比更难根治。烟草根结线虫不仅直接危害烟株,造成烟株萎蔫黄化,发育迟缓甚至整株死亡,还可诱发烟草青枯病Ralstonia solanacearum和黑胫病Phytophthora parasitica var.nicotianae等其他土传病害,其已成为我国云贵高原烟区烤烟生产的主要土传病害之一。
为有效控制烟草根结线虫病危害,国内外在化学防治、物理防治和生物防治等方面已有研究。相对而言,土壤化学熏蒸为最彻底有效的防治方法,但因熏蒸成本昂贵,且对土壤微生态环境破坏严重,致使棉隆等熏蒸剂难以在烟地大面积推广应用。随着高污染、高残留、高毒性的化学杀线剂(例如涕灭威、呋喃丹等)逐渐被淘汰或限制使用,研制绿色高效的杀线剂品种则尤为重要,其中植物源农药则为根结线虫绿色防控的一个重要研究方向。此外,随着我国城市化进程的稳步推进,农业集约化经营已成为未来农业发展的主要方向,但现今日益增加的劳动力和农资成本已愈发成为制约烤烟种植效益的重要因素。因此,降低烤烟生产环节农药化肥的施用次数和施用量,对于促进烤烟生产提质增效尤为重要,而研究烟草绿色栽培措施,创制兼具植保和肥料功效的复合功能肥料产品则是提高烤烟种植效益及维持植烟土壤环境健康的一项重要举措。
掌叶大黄(Rheum palmatum L.)为多年生草本植物,属蓼科 (Polygonaceae)大黄属(Rheum),广泛分布于我国西北和西南等地区。早在东汉时期,我国就有掌叶大黄根和根茎入药的相关记载,其具有清热去火、解毒泄下的良好药效。迄今为止,掌叶大黄在病虫害防治方面的研究主要集中在杀菌方面,而在防治害虫和线虫方面尚少有报道。我国资源丰富,从掌叶大黄的线虫防治功效出发,科学合理地进行植物源农药开发,具有广阔的市场前景。目前,国内外也尚未有关于掌叶大黄农药剂型加工的研究报道。
发明内容
本发明的目的就在于克服现有技术存在的缺点和不足,提供一种植物源杀线虫制剂及其制备方法;本发明克服了化学杀线剂的弊端,降低了农业生产环节农药化肥的用工成本,符合现代绿色农业的发展方向,对维系健康的土壤生态环境具有一定的促进作用。
本发明的目的是这样实现的:
一、植物源杀线虫制剂
原材料组分按重量百分比计:
掌叶大黄:3~12%,生物炭:8~12%,有机肥:54~64%,其余为水分。
二、植物源杀线虫制剂的制备方法
包括如下步骤:
①将掌叶大黄的根茎用清水洗净,40~60℃干燥,使含水量在6~10%,粉碎后过40~80目筛;
②将生物炭在60~80℃干燥,使含水量在18~22%,粉碎后过20~40目筛;
③将有机肥在30~50℃干燥,使含水量在24~27%,粉碎后过10~20目筛;
④将步骤①和②处理得到的原材料按权利要求1的配比进行预混合后,再与步骤③处理得到的原材料进行充分混合均匀;
⑤将预混合材料进行挤压造粒,粒径直径4~6mm,长度为6~10mm,包装制得产品。
掌叶大黄的化学成分主要为蒽醌类(anthraquinones)、蒽酮类 (anthraceneketone)、鞣质类(tannins)和二苯乙烯类(stilbenes)等物质,其发挥杀线虫作用的有效成分主要是蒽醌类物质,主要包括大黄酚 (chrysophanol)、大黄素甲醚(physcion)、大黄素(emodin)、芦荟大黄素(aloe-emodin)和大黄酸(rheinic acid)。
本发明具有下列优点和积极效果:
①本发明提供的植物源杀线虫制剂,其杀线活性原料选用天然中草药植物掌叶大黄的根茎;该材料来源相对广泛,成本低廉,适宜大量生产;与传统的化学杀线剂相比,该产品不仅对根结线虫病具有较好的防治效果,而且对土壤环境安全友好,是真正的绿色环保产品。
②本发明提供的植物源杀线虫制剂,对烟草根结线虫病具有良好的防治效果,使用后药效持效期长,缓释效果优异,对多数一年生作物一个生长季节一般只需使用一次;同时本发明产品中含有生物质有机肥、生物炭,在作物移栽前兼作基肥施用,降低了单独施药防治的人工成本,且杀线材料腐熟后还可起到绿肥的功效,使用后可有效改善土壤的理化性状,提高土壤有机质含量,对作物产量和品质起到一定的提升作用。
综上所述,本发明提供的植物源杀线虫制剂,可以有效控制根结线虫对烟草等作物的危害,对作物安全,可有效提升农产品的产量和品质;此外,使用本防治技术根结线虫难以产生抗药性,也不存在药剂残留问题,对环境安全友好,有利于维持农田生态平衡,是一种理想的植物源农药。
附图说明
图1为防治效果图。
具体实施方式
下面是对本发明进行具体描述:
一、天然植物源杀线虫制剂
优选:
掌叶大黄6%,生物炭12%,有机肥58%,其余为水分。
二、天然植物源杀线虫制剂的制备方法
优选:
掌叶大黄的烘干温度为45℃,粉碎后过60目筛;
生物炭的烘干温度为70℃,粉碎后过30目筛;
有机肥的烘干温度为40℃,粉碎后过10目筛;
所述步骤⑤中的粒径直径5mm,长度为8mm。
三、实施例
实施例1、2为植物源杀线虫制剂的制备;实施例3、4为防治实验。
1、实施例1:植物源杀线虫制剂的制备
原料配比:掌叶大黄根茎干粉650克(含水量6~10%),生物炭1500克 (含水量18~22%),有机肥7850克(含水量24~27%)。
植物源杀线虫制剂的制备步骤:
1)先将掌叶大黄的根茎用清水洗净,45℃烘干,调整含水量在6~10%,粉碎后过60目筛;
2)将生物炭在70℃干燥,调整含水量在18~22%,粉碎后过30目筛;
3)将有机肥在40℃干燥,调整含水量在24~27%,粉碎后过10目筛;
4)将步骤1)和2)处理得到的原材料进行预混合后,再与步骤3)处理得到的原材料进行充分混合均匀;
5)将预混合材料进行挤压造粒,粒径直径5mm,长度为8mm,包装制得产品。
2、实施例2:植物源杀线虫制剂的制备
原料配比:掌叶大黄1300克(含水量6~10%),生物炭1000克(含水量 18~22%),有机肥7700克(含水量24~27%)。
植物源杀线虫制剂的制备同实施例1。
3、实施例3:一种植物源杀线虫制剂对番茄根结线虫病的盆栽防治效果
番茄移栽前穴施:所用杀线虫制剂掌叶大黄含量为3%,6%和9%,粒径4 mm,长度6~10mm;施药前将洁净的营养土与根结线虫染病土以2:1(w/w)充分混合均匀,装入直径为15cm,高为20cm的塑料花盆中,每盆装入病土混样2 Kg;每盆加入颗粒剂10g,设3个重复,每重复20盆,药剂与土壤拌匀后备用;此外,对照不含掌叶大黄,仅含生物炭和有机肥;待健康的番茄幼苗长出第三片真叶后移栽到上述预先处理好的花盆中,放于塑料大棚内,统一水肥管理;60d后轻轻拔出番茄根部,根据根部根结情况调查发病轻重,统计对根结线虫病的盆栽防治效果。
按照Barker的方法对根结进行分级,分级标准如下:
0级:根系健康完整,未出现根结;1级:略微出现少量根结,且根结较小;2级:在侧根出现清晰可见的小根结,主根正常;3级:在侧根出现较大根结,主根正常;4级:侧根根结较多,主根正常;5级:主根开始出现零星根结;6级:部分主根出现明显根结;7级:绝大多数主根均出现根结;8级:所有的主根均出现根结;9级:所有根系均出现根结;10级:所有根系均出现严重根结,受侵染严重。
根据以上的分级标准计算病情指数和防治效果,计算公式分别为:
病情指数=∑(各病级植株数×该级数值)/(调查总株数×最重病级数值)×100
防治效果=(对照病情指数-处理病情指数)/对照病情指数×100%
表1植物源杀线虫剂对番茄根结线虫病的盆栽防治效果
处理 | 病情指数 | 防治效果(%) |
3% | 25.1 | 51.5±2.4b |
6% | 16.7 | 67.9±5.3a |
9% | 10.3 | 80.2±2.7a |
对照 | 51.8 | - |
从表1可知,番茄定植60d后,经过3种掌叶大黄颗粒剂处理的番茄根系根结数量均比对照组减轻,3%,6%和9%掌叶大黄含量的杀线剂处理其病情指数分别为25.1,16.7和10.3,防治效果分别为51.5%,67.9%和80.2%,其中9%掌叶大黄含量的杀线剂盆栽防效高于80%,效果明显好于3%掌叶大黄含量的杀线剂。
4、实施例4:一种植物源杀线虫制剂对烟草根结线虫病的田间防治效果
烟苗移栽前起垄塘施:所用植物源杀线剂掌叶大黄含量为6%,施用量设3 种处理,分别为60Kg/亩,75Kg/亩,100Kg/亩;将药剂按每塘(株)分3种处理,即60g/株,75g/株,100g/株撒于穴内,并与塘内土壤搅拌少许防止后期烧苗。后期按正常农事操作管理,并择机移栽烟苗,一年仅在移栽前施药防治一次,防治效果达68~85%。
试验在根结线虫发生较为严重的田地进行,采用随机区组设计,每个处理重复3次,每个小区面积为3.3m×12.0m,行距1.1m,株距0.55m,共植烟60 株。药剂在烟苗移栽前10天塘施。烟苗移栽3个月后每小区隔株抽样30株进行调查,详细记录每处理发病株数,并对每株进行病情分级,计算病情指数和病指防效。计算公式同实施例3。
调查方法为:为减少人为调查对烟株生长发育的影响,拨根调查时仅截取烟株一侧约1/3根系进行观察。成熟期拨根调查分级标准:0级,根部正常,无可见根结;1级,1/4以下根有少量根结;3级,1/4~1/3根有根结;5级, 1/3~1/2根有根结;7级,1/2以上根有根结,少量次生根上产生根结;9级,所有根上(包括次生根)长满根结。
表2植物源杀线虫剂不同施用量对烟田烟草根结线虫病的防治效果
施药量(公斤/亩) | 病情指数 | 防治效果(%) |
60 | 7.04 | 68.3±4.6b |
75 | 4.94 | 77.8±3.2ab |
100 | 3.33 | 85.0±5.0a |
对照 | 22.22 | - |
如图1,试验情况:植物源杀线剂6%掌叶大黄颗粒剂按60Kg/亩,75Kg/ 亩,100Kg/亩3种施用量处理后,在烟草采烤期调查,分析对烟草根结线虫病的防治效果及对烟草生长发育的影响。用3种施用量处理后,地上部烟株株高等长势整体均好于对照,地下部根系根结数量明显少于对照。60Kg/亩,75Kg/ 亩,100Kg/亩处理后,其防治效果分别为68.3%,77.8%和85.0%,效果优异。
使用效果:6%掌叶大黄颗粒剂可用于防治烟草根结线虫病为害,烟草栽培中移栽前按60~100Kg/亩,或按60~100g/株穴(塘)施,对烟草根结线虫病可起到明显的防治效果。
虽然本发明已以较佳实施例公开如上,但其并非用以限定本发明,任何熟悉此技术的人,在不脱离本发明的精神和范围内,都可做各种的改动与修饰,因此本发明的保护范围应该以权利要求书所界定的为准。
Claims (4)
1.一种植物源杀线虫制剂,其特征在于:
原材料组分按重量百分比计:
掌叶大黄:3~12%,生物炭:8~12%,有机肥:54~64%,其余为水分。
2.按权利要求1所述的一种植物源杀线虫制剂,其特征在于优选:
掌叶大黄6%,生物炭12%,有机肥58%,其余为水分。
3.按权利要求1或2所述一种植物源杀线虫制剂的制备方法,其特征在于:
①将掌叶大黄的根茎用清水洗净,40~60℃干燥,使含水量在6~10%,粉碎后过40~80目筛;
②将生物炭在60~80℃干燥,使含水量在18~22%,粉碎后过20~40目筛;
③将有机肥在30~50℃干燥,使含水量在24~27%,粉碎后过10~20目筛;
④将步骤①和②处理得到的原材料按权利要求1的配比进行预混合后,再与步骤③处理得到的原材料进行充分混合均匀;
⑤将预混合材料进行挤压造粒,粒径直径4~6mm,长度为6~10mm,包装制得产品。
4.按权利要求3所述一种天然植物源杀线虫制剂的制备方法,其特征在于优选:
掌叶大黄的烘干温度为45℃,粉碎后过60目筛;
生物炭的烘干温度为70℃,粉碎后过30目筛;
有机肥的烘干温度为40℃,粉碎后过10目筛;
所述步骤⑤中的粒径直径5mm,长度为8mm。
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