(仲愷農(nóng)業(yè)工程學(xué)院農(nóng)業(yè)與生物學(xué)院,廣東廣州510225;2廣東省農(nóng)業(yè)科學(xué)院植物保護(hù)研究所/農(nóng)業(yè)農(nóng)村部華南果蔬綠色防控重點(diǎn)實(shí)驗(yàn)室/廣東省植物保護(hù)新技術(shù)重點(diǎn)實(shí)驗(yàn)室,廣東廣州510640;廣東供銷綠色農(nóng)產(chǎn)品生產(chǎn)供應(yīng)基地運(yùn)營(yíng)公司,廣東惠州516166;4廣州市益農(nóng)生化有限公司,廣東廣州510800)
Benefit and Impact on the Feeding of Adult Phyllotreta striolata from Sweet Corn-Flowering Chinese Cabbage Rotation
LI SiJiel2, LI Hao4,PU XiaoMing2, ZHANGQIAN MingZhu,HOU ShengEn,BAI YuBo,YANG QiYun2,LIN BiRun2, ZHENG YiXiong
('College of Agriculture and Biology,Zhongkai Universityof Agriculture and Engineering, Guangzhou, Guangdong 510225,China;2PlantProtection Research Institute of Guangdong ProvincialAcademy of Agricultural Sciences/ Key Laboratory of GreenPrevention and Controlof South China Fruits and Vegetables,MinistryofAgriculture and Rural Affairs/ Key Laboratory of New Technology for Plant Protection in Guangdong Province, Guangzhou, Guangdong 510640, China;3 Guangdong Supply and Marketing Cooperative Green Agricultural Products Production and Supply Base Operating Company,Huizhou,Guangdong 516166, China;4Guangzhou Yinong Biochemical Co.,Ltd., Guangzhou, Guangdong 510800, China)
Abstract: 【Objective】 To overcome the obstacles of continuous cropping of vegetables and actively promote the rotation cultivation model of sweet corn-flowering Chinese cabbage, the present study investigated the ecological and economic benefits and control effect on major pests from this rotation model, so to provide a reference to fully leverage the advantages of this rotation cultivation model. 【Method】 Investigations were conducted in 3 rotation and 3 continuous cropping vegetable fields in Boluo County, Huizhou City, Guangdong Province, regarding planting patterns, varieties,pesticide and fertilizer application,and yield benefits.Diferences in Phylltreta striolata infestation were also investigated between the first crop of flowering Chinese cabbage in rotation and nonrotation vegetable fields.Additionally, the effects of the extracts from sweet corn roots and rhizosphere soil with different polar solvents on the feeding of adult P. striolata were determined, and trap experiments were conducted to verify the repellent activity.【Result】 Comparing the planting benefits and efects of fertilizer and pesticide reduction in rotation vegetable fields with that in continuous cropping vegetable fields, it was found that the annual average profit in rotation cropping was
,which increased profits by
or 8.73% compared to continuous cropping. The application amounts of compound fertilizer and pesticide formulations were significantly lower in rotation fields than in continuous cropping fields, with average reduction rates of 61.15% and 41.29% , respectively. The daily number of damaged holes caused by P. striolata in the first crop of flowering Chinese cabbage in rotation fields was reduced by 80.37% compared to that in continuous cropping fields.The test results of the activity of extracts from sweet corn roots and rhizosphere soil showed that the petroleum ether extract of rhizosphere soil (
)and the absolute ethanol extract of roots (
) had strong antifeedant and repellent effects on adult P. striolata, the antifeeding rate were 54.5% and 56.6% ,respectively. Trap experiment results indicated that the repellent rate when using the
petroleum ether extract of rhizosphere soil was 78.33% ,exhibiting the best repellent effect. 【Conclusion】 The rotation cultivation model of \"sweet corn-flowering Chinese cabbage\" has achieved quality improvement, efficiency enhancement, and fertilizer and pesticide reduction, and had good repellent effect on adult P. striolata, which provides strong technical support for promotion and application of the \"sweet corn-flowering Chinese cabbage\" rotation cultivation model.
Keywords: Sweet corn-flowering Chinese cabbage rotation model; continuous cropping obstacles; fertilizer and pesticide reduction; economic benefits; Phyllotreta striolata
0 引言
【研究意義】每年的“中央一號(hào)文件”一直都把“三農(nóng)”工作作為重點(diǎn)任務(wù)來(lái)抓,持續(xù)全面推進(jìn)鄉(xiāng)村振興,確保農(nóng)業(yè)增產(chǎn)穩(wěn)產(chǎn)、農(nóng)民穩(wěn)步增收、農(nóng)村穩(wěn)定安寧。廣東惠州市毗鄰香港,位于粵港澳大灣區(qū),是重要糧食和農(nóng)產(chǎn)品供應(yīng)基地。
惠州市博羅縣蔬菜農(nóng)場(chǎng)是大灣區(qū)重要農(nóng)產(chǎn)品供應(yīng)基地,農(nóng)場(chǎng)大部分常年耕作,農(nóng)場(chǎng)主基本上都具備了一套農(nóng)業(yè)輪作栽培技術(shù),能有效克服連作障礙問(wèn)題,保證農(nóng)場(chǎng)農(nóng)業(yè)生產(chǎn)可持續(xù)發(fā)展。【前人研究進(jìn)展】輪作是最常用和最經(jīng)濟(jì)有效的解決作物連作障礙的增產(chǎn)技術(shù)之一,除此之外,輪作還能提高資源利用效率和生產(chǎn)力(TANetal.,2020;
PELECHetal.,202I),開顯者控制柄出吾的友生(呂晴晴等,2023)。黃玉林等(2021)研究發(fā)現(xiàn)烤煙一水稻輪作可減輕病蟲害的發(fā)生,連作可能會(huì)導(dǎo)致作物生長(zhǎng)變?nèi)?、發(fā)育不良、病害加劇、品質(zhì)降低、減產(chǎn)甚至絕收等現(xiàn)象(盧維宏等,2020)。姚虹和馬建軍(2011)對(duì)胡麻進(jìn)行了連作和輪作的對(duì)比試驗(yàn),發(fā)現(xiàn)胡麻輪作比連作的產(chǎn)量提高 15.3% ,產(chǎn)量差異明顯。BULLOCK(1992)研究發(fā)現(xiàn)輪作和連作對(duì)玉米產(chǎn)量影響明顯,玉米一豌豆輪作比玉米連作增產(chǎn)
。此外,楊帆(2018)報(bào)道了輪作可以有效減少化肥使用量。可見,輪作可以促進(jìn)作物的生長(zhǎng)發(fā)育,提高作物的質(zhì)量和產(chǎn)量,實(shí)現(xiàn)作物的高效種植。近年來(lái),我國(guó)蔬菜種植面積不斷增加,且大部分地區(qū)采用連作、套種等種植方式,形成了適于黃曲條跳甲生長(zhǎng)繁殖的環(huán)境(邊強(qiáng)等,2024),使黃曲條跳甲在我國(guó)南方由次要害蟲上升為主要害蟲,并有超越小菜蛾成為蔬菜第一害蟲的趨勢(shì)(肖勇等,2021)。制定黃曲條跳甲合理有效的防治方法是蔬菜產(chǎn)業(yè)上亟須解決的難題,而目前生產(chǎn)上主要的防治方法為化學(xué)防治?;瘜W(xué)防治雖然具有見效快、效率高的優(yōu)點(diǎn),但由于黃曲條跳甲的防治主要采用葉面噴藥防治成蟲,無(wú)法兼顧處理土壤中的卵、幼蟲和蛹,而黃曲條跳甲成蟲因后足發(fā)達(dá)善于跳躍易躲避化學(xué)藥劑的噴灑防治,農(nóng)戶只能不斷增加用藥次數(shù)和用藥量,這導(dǎo)致蔬菜上的農(nóng)藥殘留普遍偏高,也使黃曲條跳甲的抗藥性越來(lái)越強(qiáng)(劉維帥,2014)。目前已有相關(guān)研究證明殺蟲劑的過(guò)度使用會(huì)導(dǎo)致黃曲條跳甲出現(xiàn)高抗藥性(王海等,2008)。此外,農(nóng)藥的過(guò)度使用還會(huì)造成環(huán)境污染等一系列問(wèn)題?!颈狙芯壳腥朦c(diǎn)】蔬菜產(chǎn)業(yè)現(xiàn)代化的發(fā)展迫切需要探索出能替代化學(xué)防治、對(duì)環(huán)境友好、無(wú)公害的防治方法?!緮M解決的關(guān)鍵問(wèn)題】本研究以博羅縣代表性菜場(chǎng)為研究對(duì)象,對(duì)輪作和連作菜場(chǎng)種植效益、減肥減藥、蟲害控制開展調(diào)查研究,特別進(jìn)行了甜玉米根系分泌物對(duì)黃曲條跳甲成蟲的驅(qū)避活性研究,目的是探討“甜玉米一菜心”輪作技術(shù)是否對(duì)防治黃曲條跳甲有效,并闡明其原因,從而為“甜玉米一菜心”輪作技術(shù)推廣應(yīng)用提供技術(shù)支撐。
1 材料與方法
1.1 試驗(yàn)材料
供試蟲源:黃曲條跳甲[Phyllotretastriolata(Fabricius)]來(lái)源于廣東省農(nóng)業(yè)科學(xué)院植物保護(hù)研究所試驗(yàn)菜地。
1.2 試驗(yàn)方法
1.2.1輪作和連作菜場(chǎng)調(diào)查
調(diào)查地點(diǎn)為廣東省惠州市博羅縣。2022年11月至2023年10月分別調(diào)查了具有代表性的3個(gè)輪作菜場(chǎng)和3個(gè)連作菜場(chǎng)。試驗(yàn)詳細(xì)調(diào)查了菜場(chǎng)種植管理情況并記錄相關(guān)數(shù)據(jù),包括種植品種、種植時(shí)間、施肥種類、施肥量、病蟲害發(fā)生情況、農(nóng)藥使用情況、種植成本、產(chǎn)量及產(chǎn)值等;并統(tǒng)計(jì)不同菜場(chǎng)每年度的施肥總量和施藥總量,比較輪作菜場(chǎng)與連作菜場(chǎng)施肥施藥的差異;此外對(duì)輪作菜場(chǎng)和連作菜場(chǎng)的經(jīng)濟(jì)效益也進(jìn)行了調(diào)查、統(tǒng)計(jì)和分析。
1.2.2輪作甜玉米對(duì)黃曲條跳甲為害的影響
在第二茬甜玉米種植結(jié)束后,輪作菜場(chǎng)開始種植首茬菜心,第一茬菜心種植期約為
,每隔一天調(diào)查一次黃曲條跳甲的為害情況。同時(shí)對(duì)輪作菜場(chǎng)附近(
以外)連作菜場(chǎng)里黃曲條跳甲的為害情況進(jìn)行調(diào)查。調(diào)查時(shí)分別找10個(gè)點(diǎn)位,每個(gè)點(diǎn)位調(diào)查10株,實(shí)時(shí)記錄黃曲條跳甲咬食的孔洞數(shù),并計(jì)算出平均值,然后按照數(shù)據(jù)分別繪制輪作菜場(chǎng)和連作菜場(chǎng)黃曲條跳甲為害孔洞數(shù)的曲線圖,比較輪作菜場(chǎng)和連作菜場(chǎng)上黃曲條跳甲的為害差異。
1.2.3輪作后甜玉米根及根際土提取物對(duì)黃曲條跳甲的驅(qū)避作用
1.2.3.1甜玉米根和根際土的粗提物提取
將采集的甜玉米根和土分離,取根際土,并將甜玉米根切下用攪拌機(jī)搗碎。稱取
搗碎的甜玉米根和
根際土各4份,共8份;然后用
石油醚、無(wú)水乙醇、乙酸乙酯及二氯甲烷4種不同有機(jī)溶劑分別浸提,之后將8份浸提液分別用旋轉(zhuǎn)蒸發(fā)儀濃縮至膏狀,得到8種提取物(A1為石油醚根提取物;A2為石油醚根際土提取物;B1為無(wú)水乙醇根提取物;B2為無(wú)水乙醇根際土提取物;C1為乙酸乙酯根提取物;C2為乙酸乙酯根際土提取物;D1為二氯甲烷根提取物;D2為二氯甲烷根際土提取物),置于4℃冰箱中密封保存?zhèn)溆谩?/p>
1.2.3.2 提取物對(duì)黃曲條跳甲驅(qū)避活性測(cè)定
稱取1.2.3.1所述步驟中提取的8種甜玉米根根際土提取物用水進(jìn)行溶解,并加入少量吐溫-80乳化,必要時(shí)置于
的恒溫水浴鍋中振蕩助溶,配制成不同濃度梯度的甜玉米根系/根際土提取物溶液。對(duì)照溶液為相同劑量的吐溫-80溶液。具體濃度梯度為:石油醚甜玉米根提取物濃度系列為
1.12mg/L 、
、 $11.25\upmu\mathrm{g/L}$ ,石油醚甜玉米根際土提取物濃度系列為
、
、$16.30~\upmu\mathrm{g/L}$ ;無(wú)水乙醇甜玉米根提取物濃度系列為
、
, $21.00~\upmu\mathrm{g/L}$ ,無(wú)水乙醇甜玉米根際土提取物濃度系列為 0.27mg/L ,
、$2.75~\upmu\mathrm{g/L}$ ;乙酸乙酯甜玉米根提取物濃度系列為1.32mg/L 、
、 $13.20~\ensuremath{\upmu\mathrm{g/L}}$ ,乙酸乙酯甜玉米根際土提取物濃度系列為
,
、$12.65~\upmu\mathrm{g/L}$ ;二氯甲烷甜玉米根提取物濃度系列為
、
、 $8.50~\upmu\mathrm{g/L}$ ,二氯甲烷甜玉米根際土提取物濃度系列為 5.69mg/L 、 0.57mg/L 、$56.95~\upmu\mathrm{g/L}$ o
驅(qū)避活性試驗(yàn)方法主要參照賢振華等(2009)方法,具體如下。
(1)浸漬圓葉碟法:將新鮮平整且沒有蟲孔的菜心葉片用圓形打孔器(
)打成葉碟,并放入對(duì)照有機(jī)溶劑溶液和不同處理的甜玉米根系/根際土提取物溶液中浸漬5\~8s后取出,用干凈濾紙吸取多余藥液,晾干作為對(duì)應(yīng)處理葉碟。
(2)選擇性取食活性實(shí)驗(yàn):在墊有保濕濾紙的培養(yǎng)皿(
)中放入處理和對(duì)照葉碟各15張,葉背向上均勻列為圓形擺放;每個(gè)皿接入3頭饑餓
以上的黃曲條跳甲成蟲,用保鮮膜封口,并用針刺孔以透氣;每個(gè)處理15皿,并隨機(jī)均分為3組,作為3次重復(fù);接入蟲后的
和 24h 用透明坐標(biāo)方格紙測(cè)量葉碟被取食面積(試驗(yàn)中應(yīng)根據(jù)具體取食情況及時(shí)添加經(jīng)過(guò)相同處理的葉碟),觀察黃曲條跳甲成蟲死亡情況,記錄死亡數(shù)量。按照下列公式計(jì)算死亡率和校正死亡率:
① 死亡率(%) σ=σ 處理死亡蟲數(shù)/處理總蟲數(shù) ×100 ② 校正死亡率 (%)= (處理死亡率-對(duì)照死亡率)/(1-對(duì)照死亡率) ×100
③ 拒食率
(對(duì)照取食面積-處理取食面積)/對(duì)照取食面積 ×100
(3)非選擇性取食活性實(shí)驗(yàn):在墊有保濕濾紙的培養(yǎng)皿(
)中放入處理葉碟15張,對(duì)照葉碟15張放入另一培養(yǎng)皿中,葉背向上均勻列為圓形擺放,其他操作同選擇性取食活性測(cè)定。
(4)陷阱實(shí)驗(yàn):在選擇性和非選擇性取食活性實(shí)驗(yàn)結(jié)果的基礎(chǔ)上開展陷阱實(shí)驗(yàn)。在120目定制蟲網(wǎng)籠(長(zhǎng)
,寬
,高 30cm )中,左右各放兩盆菜心,左側(cè)為對(duì)照組,右側(cè)為處理組,同時(shí)每個(gè)蟲網(wǎng)籠接入150頭饑餓
以上的黃曲條跳甲成蟲,觀察
、
、 18h 、 24h 后黃曲條跳甲取食的情況,并實(shí)時(shí)記錄數(shù)據(jù)。
1.3 數(shù)據(jù)處理
本文主要采用Excel2017、SPSS19.0、Graph-pad Prism 5.0和AdobeillustrateCS6V.16.00軟件進(jìn)行數(shù)據(jù)統(tǒng)計(jì)分析。
2 結(jié)果與分析
2.1輪作菜場(chǎng)與連作菜場(chǎng)施肥、施藥及經(jīng)濟(jì)效益對(duì)比
從表1可知,輪作菜場(chǎng)的復(fù)合肥施肥次數(shù)和復(fù)合肥施肥量均大大少于連作菜場(chǎng),復(fù)合肥施肥量減少 61.15% ;輪作菜場(chǎng)的有機(jī)肥施肥次數(shù)和施肥量也明顯少于連作菜場(chǎng),有機(jī)肥施肥量減少 22.79% 0
從表2可知,輪作菜場(chǎng)的施藥次數(shù)和施藥劑量均小于連作菜場(chǎng),施藥量減少 41.29% 0
輪作菜場(chǎng)平均總利潤(rùn)31700元
,比連作菜場(chǎng)利潤(rùn)增加2545元
,增幅為 8.73% (見表3)。
綜上所述,輪作菜場(chǎng)的施肥次數(shù)和施藥次數(shù)比連作菜場(chǎng)少,施肥量和農(nóng)藥使用量也顯著降低,成本更低,利潤(rùn)更高。

(連作施肥量-輪作施肥量)/連作施肥量 ×100 Note: Reductionrate of fertilization
(fertilizationamountincontinuouscropping-fertilizationamountinrotation)/fertilizationamountincontinuouscropping ×100
(連作施藥量-輪作施藥量)/連作施藥量 ×100 6 Note: Reduction rate of pesticide application (%)= (pesticideapplicationamountincontinuouscropping-pesticideapplicationamountinrotation)/pesticideapplication amount in continuous cropping ×100
2.2輪作對(duì)黃曲條跳甲的防控作用
2.2.1甜玉米輪作后第一茬菜心黃曲條跳甲的為害情況
在甜玉米采收后,于11月開始輪作種植第一茬菜心,對(duì)首茬菜心的整個(gè)生長(zhǎng)周期進(jìn)行黃曲條跳甲為害監(jiān)測(cè),同時(shí)也對(duì)相鄰連作菜場(chǎng)同周期的菜心進(jìn)行黃曲條跳甲為害監(jiān)測(cè),并將二者進(jìn)行對(duì)比。如圖1和圖2所示,連作菜場(chǎng)的為害孔洞數(shù)遠(yuǎn)高于輪作菜場(chǎng),輪作菜場(chǎng)的平均日為害孔洞數(shù)比連作菜場(chǎng)減少 80.37% ,說(shuō)明輪作甜玉米后,第一茬菜心黃曲條跳甲為害率顯著降低。


2.2.2選擇性取食活性實(shí)驗(yàn)
由表4至表7可知,甜玉米根的 1.12mg/L 石油醚提取物、
和
無(wú)水乙醇提取物、 1.32mg/L 乙酸乙酯提取物處理對(duì)黃曲條跳甲的拒食率高于 50% ;根際土的
和
石油醚提取物、
乙酸乙酯提取物處理對(duì)黃曲條跳甲成蟲的拒食率也均高于 50% ,說(shuō)明這些提取物均有較好的拒食驅(qū)避活性。

。Note:Different lowercase letters behind data in the same colum indicated significant differences( Plt;0.05) ·

注:同列數(shù)據(jù)后不同小寫字母表示差異顯著 (Plt;0.05) 。Note:Different lowercase letters behinddata inthe same colum indicated significantdifferences (Plt;0.05)
注:同列數(shù)據(jù)后不同小寫字母表示差異顯著 (Plt;0.05) 。Note:Different lowercase letters behind data in the same colum indicated significant differences( Plt;0.05)

2.2.3非選擇性取食活性實(shí)驗(yàn)
由表8非選擇性試驗(yàn)黃曲條跳甲的死亡率可知,根際土石油醚提取物處理組的死亡率以及根無(wú)水乙醇根處理組的死亡率較低,再結(jié)合選擇性
試驗(yàn)的驅(qū)避效果,確定了具有拒食驅(qū)避活性的處理組分別為
甜玉米根際土石油醚提取物的處理和 2.10mg/L 甜玉米根無(wú)水乙醇提取物處理。


2.2.4陷阱實(shí)驗(yàn)曲線下面積不同提取物處理的黃曲條跳甲成蟲驅(qū)避率
本研究根據(jù)選擇性和非選擇性取食活性實(shí)驗(yàn)的結(jié)果,選擇
和 0.16mg/L 的根際土石油醚提取物、
和
的根無(wú)水乙醇提取物開展陷阱實(shí)驗(yàn)。由圖3至圖6計(jì)算出各處理對(duì)黃曲條跳甲成蟲的驅(qū)避率(表9)。由表9可知,
根際土石油醚提取物處理后的驅(qū)避率為78.3% ,驅(qū)避效果最優(yōu); 2.10mg/L 根無(wú)水乙醇提取物處理后的驅(qū)避效果次之,說(shuō)明根際土石油醚提取物中具有較高的驅(qū)避活性。





Fig.5 Selective preference effect of 2.10mg/L sweet corn rhizosphere soil extract with ethanol on adult of P. striolata


3 討論
3.1輪作可解決連作障礙問(wèn)題,提高經(jīng)濟(jì)效益
連作常導(dǎo)致作物產(chǎn)量與品質(zhì)下降,給作物生產(chǎn)帶來(lái)嚴(yán)重威脅,而通過(guò)合理輪作可有效解決這些威脅。于松漢等(2020)報(bào)道花生一糯玉米一連州菜心周年輪作栽培技術(shù)可極大地提高土地產(chǎn)出效益。楊柳青等(2008)提出的“菜心一超甜玉米一優(yōu)質(zhì)稻”無(wú)公害生產(chǎn)輪作模式,充分利用了土地、光能等自然資源,提高了土地利用率、復(fù)種指數(shù)和作物產(chǎn)量,取得顯著的經(jīng)濟(jì)、生態(tài)和社會(huì)效益。沈建龍(2023)報(bào)道,河西鎮(zhèn)采用“玉米 + 蔬菜”輪作模式,減少了農(nóng)藥、肥料以及水的使用,實(shí)現(xiàn)了經(jīng)濟(jì)社會(huì)發(fā)展和生態(tài)保護(hù)治理的“雙贏”。韋飛燕(2022)報(bào)道,柳州市的生姜一菜心一香蔥一年三熟種植模式,提高了蔬菜種植產(chǎn)量和品質(zhì)。PETERSON等(1991)試驗(yàn)對(duì)比了兩年輪作制和兩年連作制的玉米產(chǎn)量,發(fā)現(xiàn)輪作可增產(chǎn)
。本文通過(guò)輪作和連作菜場(chǎng)比較,發(fā)現(xiàn)“甜玉米一菜心”輪作可顯著減少農(nóng)藥化肥使用量,輪作菜場(chǎng)比連作菜場(chǎng)復(fù)合肥施肥量和農(nóng)藥使用量分別減少率為 61.15% 和 41.29% ,這與前人的相關(guān)報(bào)道是一致的。同時(shí),“甜玉米一菜心輪作”還可解決廣東省露地蔬菜連作障礙問(wèn)題,使夏季高溫土地不用閑置,并提高甜玉米等糧食作物的種植面積。
3.2輪作甜玉米的根系分泌物對(duì)病蟲害控制效果
根系分泌物是植物在生長(zhǎng)過(guò)程中分泌到根際生態(tài)環(huán)境中的有機(jī)物質(zhì)(史剛榮,2004),這些物質(zhì)可以影響植物生長(zhǎng),也可以影響下茬農(nóng)作物生長(zhǎng)及環(huán)境生態(tài)。在有效的輪作模式下,不同作物之間的根系分泌物可以相互協(xié)同,以抵抗生長(zhǎng)中的不利因素。同時(shí),玉米根系分泌物能有效抑制王傳病害病原菌生長(zhǎng),如煙草黑脛病菌(張立猛等,2015)、大豆疫霉(ZHANGetal.,2020),且能緩解連作作物產(chǎn)生的酚酸類物質(zhì)的化感作用(李慶凱等,2019),可在一定程度上克服連作障礙。本研究在“甜玉米一菜心”輪作過(guò)程中,發(fā)現(xiàn)輪作甜玉米后,種植第一茬菜心上的黃曲條跳甲的為害率顯著降低,相對(duì)于連作菜心地黃曲條跳甲的平均日為害孔洞數(shù)減少 80.37% ,具有非常顯著的防控效果。為探明機(jī)制,通過(guò)進(jìn)一步采用不同極性的有機(jī)溶劑提取甜玉米根及根際土中的分泌物,使用粗提物進(jìn)行生物活性測(cè)定,發(fā)現(xiàn)石油醚提取根際土和無(wú)水乙醇提取玉米根的提取物具有良好的拒食驅(qū)避活性,并通過(guò)陷阱實(shí)驗(yàn)驗(yàn)證了這2種提取物的生物活性。
4結(jié)論
本研究的結(jié)果表明,“甜玉米一菜心”輪作模式可有效減少菜場(chǎng)復(fù)合肥施肥量和農(nóng)藥使用量,減少率分別為 61.15% 和 41.29% 。同時(shí),該輪作模式還可有效提高菜場(chǎng)的年平均利潤(rùn),增加利潤(rùn)為2545元
,增幅 8.73% 。此外,該模式還有效減少了黃曲條跳甲成蟲為害,第一茬菜心的黃曲條跳甲平均日為害孔洞數(shù)相對(duì)于連作蔬菜地減少了80.37% 。用石油醚提取的甜玉米根際土提取物
和無(wú)水乙醇提取的根提取物
對(duì)黃曲條跳甲具有較強(qiáng)的驅(qū)避活性。
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(責(zé)任編輯 李菊馨)