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        助劑對(duì)植保無人機(jī)噴施霧滴沉積特性和棉蚜防效的影響

        2024-01-01 00:00:00李鵬飛劉富強(qiáng)馮宏祖鄭藝翔武剛王蘭
        棉花學(xué)報(bào) 2024年3期
        關(guān)鍵詞:螺蟲植保無人機(jī)棉蚜

        收稿日期:2024-03-18" " "第一作者簡介:李鵬飛(1996―),男,博士,547895148@qq.com。*通信作者:馮宏祖,fhzzky@163.com;王蘭,wang-lan95@163.com

        基金項(xiàng)目:新疆生產(chǎn)建設(shè)兵團(tuán)財(cái)政科技計(jì)劃(2021DB008);新疆生產(chǎn)建設(shè)兵團(tuán)科技創(chuàng)新人才計(jì)劃(2022CB004-01)

        摘要:【目的】探明植保無人機(jī)噴施農(nóng)藥時(shí)添加助劑對(duì)霧滴沉積特性和棉蚜防治效果(防效)的影響?!痉椒ā窟x用大疆T30植保無人機(jī)在棉花蕾期進(jìn)行田間噴霧試驗(yàn),比較添加6種助劑(牙克透、倍達(dá)通、植物三餐、農(nóng)健飛、奇功和倍倍加)對(duì)39%螺蟲·噻嗪酮懸浮劑的霧滴粒徑、密度、覆蓋率和沉積量及棉蚜防效的影響?!窘Y(jié)果】與不添加助劑的對(duì)照相比,添加6種助劑均能提高棉花上部、中部和下部葉片上的霧滴密度、覆蓋率和沉積量。添加倍倍加、倍達(dá)通處理的霧滴粒徑、密度、覆蓋率和沉積量均較大,棉株上部、中部和下部葉片上的霧滴密度、覆蓋率和沉積量均顯著高于對(duì)照處理。添加6種助劑的各處理在藥后1 d、3 d、7 d和14 d對(duì)棉株上部、中部和下部棉蚜的防效均高于對(duì)照處理,其中,添加倍倍加處理的防效最好,倍達(dá)通處理次之?!窘Y(jié)論】添加助劑倍倍加和倍達(dá)通可改善霧滴沉積特性,對(duì)棉蚜具有較好的防效,對(duì)39%螺蟲·噻嗪酮懸浮劑防治棉蚜具有很好的增效作用。

        關(guān)鍵詞:植保無人機(jī);助劑;螺蟲·噻嗪酮;霧滴沉積特性;棉蚜;防治效果

        Effects of adjuvants on deposition characteristics of spray droplets applied by plant protection unmanned aerial vehicle and control efficiency on Aphis gossypii

        Li Pengfei1, Liu Fuqiang1, Feng Hongzu1*, Zheng Yixiang1, Wu Gang2, Wang Lan1*

        (1. Tarim University/Key Laboratory of Integrated Pest Management of The Xinjiang Production and Construction Corps in Southern Xinjiang/Key Laboratory of Protection and Utilization of Biological Resources in Tarim Basin of The Xinjiang Production and Construction Corps, Aral, Xinjiang 843300, China; 2. Agricultural Science Research Institute of 1st Division of The Xinjiang Production and Construction Corps, Aral, Xinjiang 843300, China)

        Abstract: [Objective] This research aims to explore the effects of adjuvants during pesticide spraying by plant protection unmanned aerial vehicle (UAV) on droplet deposition characteristics and control efficiency on Aphis gossypii. [Methods] Dajiang T30 UAV was selected to conduct a field spray experiment during the cotton budding stage. The effects of 6 adjuvants (Yaketou, Beidatong, Zhiwusancan, Nongjianfei, Qigong, and Beibeijia) in 39% spirotetramat buprofezin on the size, density, coverage, and deposition amount of droplets and control efficiency on A. gossypii were compared. [Results] Compared with the control without adjuvant, treatments with the" adjuvants increased the droplet density, coverage, and deposition amount on the upper, middle, and lower leaves of cotton plant. The droplet size, density, coverage, and deposition amount treated with Beibeijia and Beidatong were all higher; of which the density, coverage, and deposition amount on the upper, middle, and lower leaves of cotton plants were significantly higher than those of the control treatment. The control efficiency on A. gossypii of treatments with adjuvants in the upper, middle, and lower parts of cotton plant was higher than that of the control treatment at 1 d, 3 d, 7 d, and 14 d after application. The control efficiency of the treatment with Beibeijia was the best, followed by the treatment with Beidatong." [Conclusion] The addition of Beibeijia and Beidatong can improve the deposition characteristics of droplets and has a good control effect on A. gossypii. It also has a good synergism on the control of A. gossypii with 39% spirotetramat buprofezin suspension.

        Keywords: plant protection unmanned aerial vehicle; adjuvants; spirotetramat buprofezin; deposition characteristics of droplet; Aphis gossypii; control efficiency

        由于新疆獨(dú)特優(yōu)越的自然環(huán)境,高度機(jī)械化的生產(chǎn)方式,伴隨著“一帶一路”的發(fā)展契機(jī),新疆棉花產(chǎn)業(yè)在我國棉花產(chǎn)業(yè)中占據(jù)主要地位,國際競爭力不斷提高。據(jù)統(tǒng)計(jì),2023年新疆棉花播種面積為236.93萬hm2,棉花產(chǎn)量達(dá)511.2萬t,約占全國棉花總產(chǎn)量的91%[1],實(shí)現(xiàn)了質(zhì)量、效益“雙提升”。因此,保證新疆棉花安全生產(chǎn)具有重要的戰(zhàn)略意義。20世紀(jì)80年代棉蚜(Aphis gossypii)開始對(duì)新疆棉花造成危害,隨著新疆棉花種植面積的擴(kuò)大,加上作物種植結(jié)構(gòu)單一,導(dǎo)致棉蚜頻發(fā),嚴(yán)重制約了棉花的優(yōu)質(zhì)、高效生產(chǎn)[2-3]。棉蚜在棉花葉片背面和芽尖嫩葉部位吸食汁液,導(dǎo)致棉株?duì)I養(yǎng)不良,蕾鈴脫落,一般造成減產(chǎn)15%~30%,嚴(yán)重時(shí)甚至絕收;同時(shí)棉蚜分泌蜜露污染棉纖維,致使棉花纖維品質(zhì)下降[4]。長期以來,棉蚜的化學(xué)防治主要依賴傳統(tǒng)的背負(fù)式噴霧器或懸掛式噴桿噴霧機(jī)進(jìn)行噴霧。傳統(tǒng)的施藥方式不僅造成農(nóng)藥利用率降低,而且農(nóng)民為保證防治效果(防效)普遍過度用藥,導(dǎo)致農(nóng)藥大量殘留,農(nóng)藥污染日趨嚴(yán)重[5-6]。農(nóng)藥在作物上的沉積效果是影響其藥效的關(guān)鍵因素,而藥液在作物上的沉積效果與植保機(jī)械有很大的關(guān)系[7]。

        植保無人機(jī)作為新型的施藥裝備改變了傳統(tǒng)的藥液噴灑方式。相比于地面施藥裝備,無人機(jī)作業(yè)的優(yōu)勢在于不受田間灌溉的影響,不會(huì)對(duì)棉花造成機(jī)械損傷,甚至可在夜間作業(yè),打破了作業(yè)時(shí)間限制,在棉蚜爆發(fā)期能快速阻止棉蚜擴(kuò)散[8]。植保無人機(jī)噴霧技術(shù)的迅猛發(fā)展和應(yīng)用引起了人們的廣泛關(guān)注,越來越多的研究者通過大田噴霧試驗(yàn)獲得霧滴沉積特性和病蟲害防效數(shù)據(jù),研究無人機(jī)噴灑藥效的各種影響因素。Chen等[9]利用無線風(fēng)速傳感測量系統(tǒng)研究了無人機(jī)下洗風(fēng)場對(duì)噴施霧滴在水稻冠層的沉積分布規(guī)律的影響。邱白晶等[10]構(gòu)建了無人機(jī)飛行高度、速度與霧滴沉積濃度、沉積均勻性之間的關(guān)系模型。王昌陵等[11]對(duì)比了4種國產(chǎn)植保無人機(jī)施藥霧滴在小麥冠層的沉積分布。秦維彩等[12]篩選出適于高稈作物噴霧使用的無人機(jī)噴灑參數(shù)。趙冰梅等[13]研究了植保無人機(jī)在棉蚜防治中的應(yīng)用。研究人員探究了植保無人機(jī)的飛行參數(shù)設(shè)置,篩選了防治棉蚜的藥劑和助劑等[14-18]。這些研究為植保無人機(jī)的應(yīng)用提供了理論支撐。在現(xiàn)代農(nóng)業(yè)快速發(fā)展的背景下,植保無人機(jī)通過多種傳感器,應(yīng)用專用藥劑和配套的助劑,可實(shí)現(xiàn)精準(zhǔn)施藥,從而提高農(nóng)藥的利用率[19]。

        近年來,本團(tuán)隊(duì)研究了植保無人機(jī)噴施不同類型、不同用量的殺蟲劑對(duì)新疆棉田棉蚜防效的影響[14-18],發(fā)現(xiàn)39%(質(zhì)量分?jǐn)?shù),下同)螺蟲·噻嗪酮懸浮劑(suspension concentrates, SC)具有較好的效果[16]。39%螺蟲·噻嗪酮由螺蟲乙酯與噻嗪酮混配而成,是1種活性較高且具有內(nèi)吸性、觸殺作用和胃毒作用的廣譜性殺蟲劑,對(duì)蚜蟲、飛虱、木虱等害蟲具有較高毒殺活性和較好的防效,表現(xiàn)出較好的速效性和較長的持效期[20]。已有的研究表明,助劑可以通過影響藥液的理化性質(zhì),降低藥液的表面張力、提高潤濕滲透性、優(yōu)化霧滴分布的均勻性、降低霧滴在作物表面上的接觸角、增加藥液在作物上的沉積量,進(jìn)而提高農(nóng)藥的利用率[21-23]。在作物病蟲害的防治中,對(duì)于一些不能達(dá)到理想防效的藥劑,可通過添加助劑提高藥液在作物表面上的沉積量來提高防效[24-26]。螺蟲乙酯與噻嗪酮對(duì)棉蚜具有超高活性,且對(duì)哺乳動(dòng)物低毒,目前有關(guān)螺蟲乙酯與噻嗪酮單劑及其與助劑混配對(duì)棉蚜防效的研究較多,但39%螺蟲·噻嗪酮SC添加助劑后能否改善植保無人機(jī)噴施的霧滴沉積特性和提高對(duì)棉蚜的防效尚不清楚。本研究以39%螺蟲·噻嗪酮SC為供試藥劑,添加6種不同的助劑,采用大疆T30植保無人機(jī)進(jìn)行噴霧,研究不同處理下的霧滴沉積特性及對(duì)棉蚜的田間防效,以期為植保無人機(jī)防治棉蚜中農(nóng)藥的減施增效提供理論指導(dǎo)和數(shù)據(jù)支撐。

        1 材料與方法

        1.1 供試材料

        噴霧作業(yè)使用大疆T30植保無人機(jī)(深圳市大疆創(chuàng)新科技有限公司),藥箱容量為30 L,最大作業(yè)飛行速度為7 m·s-1,最大有效噴幅為4~9 m,噴頭類型為SX11001VS。用賽默飛世爾(上海)儀器有限公司的Thermo Multiskan FC酶標(biāo)儀測定吸光度值。

        供試藥劑為39%螺蟲·噻嗪酮SC(登記證號(hào):PD20182784,山東一覽科技有限公司);供試助劑見表1。

        1.2 試驗(yàn)方法

        1.2.1 試驗(yàn)設(shè)計(jì)。于2022年在新疆生產(chǎn)建設(shè)兵團(tuán)第一師農(nóng)業(yè)科學(xué)研究所試驗(yàn)基地(阿拉爾市)開展大田試驗(yàn)。該試驗(yàn)地土壤質(zhì)地為壤土,肥力中等。棉花品種為新陸中85號(hào),采用膜下滴灌、1膜4行栽培模式,株距 10 cm,行距(66+10)cm。4月19日播種。各小區(qū)的棉花長勢和田間管理措施一致。

        根據(jù)藥劑和助劑的田間推薦使用劑量,設(shè)以下8個(gè)處理。A:39%螺蟲·噻嗪酮SC+牙克透33.3 g·L-1;B:39%螺蟲·噻嗪酮SC+倍達(dá)通15 g·L-1;C:39%螺蟲·噻嗪酮SC+植物三餐1 g·L-1;D:39%螺蟲·噻嗪酮SC+農(nóng)健飛2.8 g·L-1;E:39%螺蟲·噻嗪酮SC+奇功1.53 g·L-1;F:39%螺蟲·噻嗪酮SC+倍倍加1.35 g·L-1;G:39%螺蟲·噻嗪酮SC;CK:清水。A~G處理下39%螺蟲·噻嗪酮SC用量均為7.3 g·L-1。每個(gè)處理重復(fù)3次,共24個(gè)小區(qū),每小區(qū)面積為2 000 m2(100 m×20 m),采用隨機(jī)區(qū)組排列,小區(qū)之間設(shè)立2 m寬的保護(hù)帶。2022年6月19日(蕾期)施藥,提前規(guī)劃各小區(qū)無人機(jī)飛行航線,按照公司推薦的飛行參數(shù),設(shè)定無人機(jī)飛行速度為5.5 m·s-1,飛行高度3 m,噴幅寬度5 m,施藥量為22.5 L·hm-2。施藥當(dāng)天平均氣溫26 ℃,相對(duì)濕度26%,無風(fēng)。

        1.2.2 采樣點(diǎn)布置。如圖1所示,施藥前在各個(gè)小區(qū)垂直于植保無人機(jī)飛行航線的噴幅范圍內(nèi)布置3條采樣線,采樣線間隔20 m,每條采樣線上布置19個(gè)霧滴信息采樣點(diǎn),采樣點(diǎn)間隔1 m。每個(gè)采樣點(diǎn)選1株棉花,在棉株下部(距地面20 cm)、中部(距地面40 cm)和上部(距地面60 cm)葉片正面各布置1張霧滴測試卡(70 mm×30 mm)和1張麥拉片(70 mm×30 mm)。每次試驗(yàn)完成后,收集采樣點(diǎn)上的霧滴測試卡和麥拉片,放置在密封袋中帶回實(shí)驗(yàn)室,分析霧滴密度、霧滴粒徑和霧滴覆蓋率等參數(shù)。

        1.2.3 霧滴沉積特性。參考邱占奎等[27]和Gao等[28]的方法。用分析天平準(zhǔn)確稱取0.011 8 g 85%誘惑紅,用蒸餾水溶解并定容至10 mL,配制成1 000 mg·L-1的母液。用移液槍吸取一定量的母液進(jìn)行稀釋,配置成質(zhì)量濃度分別為1 000、500、250、125、62.5、10 mg·L-1的標(biāo)準(zhǔn)液,用酶標(biāo)儀在514 nm波長下測定其吸光度值,每個(gè)濃度連續(xù)測定3次,取吸光度的平均值繪制質(zhì)量濃度-吸光度值標(biāo)準(zhǔn)曲線。通過線性擬合獲得誘惑紅濃度與吸光度值之間的線性回歸方程:

        As=0.003 1Ce+0.194 6 " (1)

        式中,Ce為誘惑紅濃度(mg·L-1),As為測定溶液的吸光度值,R2=0.959 9。

        施藥前,向藥液中加入5 g·L-1誘惑紅作為噴霧染色劑,以代替藥劑來測定噴霧霧滴的沉積量[29]。噴霧結(jié)束待藥液干涸后收集水敏紙和麥拉片并裝入自封袋帶回室內(nèi),收集時(shí)注意戴手套避免水敏紙污染。用深圳市大疆創(chuàng)新科技有限公司研發(fā)的Droplet Analyzer霧滴測試儀對(duì)采集的霧滴測試卡進(jìn)行掃描,可得出霧滴粒徑(μm)、霧滴密度(個(gè)·cm-2)和霧滴覆蓋率(%)參數(shù)。

        麥拉片洗脫時(shí),向每個(gè)自封袋中加入5 mL純凈水,120 r·min-1震蕩5 min,然后取洗脫液3 mL使用酶標(biāo)儀在514 nm波長下測定其吸光度值,根據(jù)公式(1)計(jì)算誘惑紅濃度。然后,計(jì)算單位面積的霧滴沉積量。

        β=Ce×V/S (2)

        式中,β為單位面積的霧滴沉積量(μL·cm-2);V為加入的洗脫液體積(mL);S為霧滴收集器麥拉卡的面積(cm2)。

        1.2.4 防效調(diào)查。采用5點(diǎn)法進(jìn)行調(diào)查,每點(diǎn)選3株棉花,每株掛牌分別調(diào)查棉株上部、中部和下部3片有蚜蟲的棉葉,并在施藥前1 d及施藥后1 d、3 d、7 d和14 d調(diào)查蚜蟲數(shù)量[30]。以噴施等量清水為空白對(duì)照,計(jì)算蟲口減退率和防效。

        R=(N0-N1)/N0×100%" " (3)

        E=(R1-R0)/(1-R0)×100%" "(4)

        式中,R為蟲口減退率,N0為施藥前(或噴水前)的蟲數(shù),N1為施藥后(或噴水后)的蟲口數(shù);E為防效,R1為藥劑處理區(qū)的蟲口減退率,R0為空白對(duì)照區(qū)的蟲口減退率。

        1.3 數(shù)據(jù)處理與分析

        所有試驗(yàn)數(shù)據(jù)均采用Microsoft Excel 2019和 SPSS 25.0軟件進(jìn)行處理。數(shù)據(jù)進(jìn)行正態(tài)分布檢驗(yàn)和方差齊性檢驗(yàn),采用單因素方差分析和鄧肯多重范圍檢驗(yàn)(鄧肯氏新復(fù)極差法)進(jìn)行差異顯著性分析。

        2 結(jié)果與分析

        2.1 助劑對(duì)霧滴沉積特性的影響

        2.1.1 助劑對(duì)霧滴粒徑的影響。倍倍加處理(F處理)下棉株上部、中部和下部的霧滴粒徑均顯著高于其他6個(gè)處理(圖2)。與未添加助劑的G處理相比,F(xiàn)處理下棉株上部、中部和下部的霧滴粒徑分別顯著增加18.52%、22.00%和25.59%;B處理下棉株上部的霧滴粒徑與G處理無顯著差異,中部和下部的霧滴粒徑較G處理分別顯著增加9.21%和9.65%;A、C、D和E處理下棉株上部、中部和下部的霧滴粒徑較G處理均顯著降低。

        2.1.2 助劑對(duì)霧滴密度的影響。與G處理相比,添加助劑后(A~F處理)棉株上部、中部和下部的霧滴密度均有所增加(圖3)。A~F處理的棉株上部霧滴密度均顯著增加,其中,F(xiàn)處理下棉株上部霧滴密度最大,達(dá)到37.30個(gè)·cm-2,較G處理提高35.66%,與B和E處理差異不顯著。除D處理外,其他5個(gè)添加助劑處理的棉株中部霧滴密度顯著增加,其中,F(xiàn)處理下棉株中部霧滴密度最大,為22.30 個(gè)·cm-2,較G處理提高46.19%,與B、C和E處理差異不顯著。B、E和F處理的棉株下部霧滴密度較G處理分別顯著提高79.10%、123.88%和128.36%。

        2.1.3 助劑對(duì)霧滴覆蓋率的影響。A~G處理下棉株上部、中部和下部霧滴覆蓋率的變化范圍為0.7%~3.3%(圖4)。同一處理下,棉株上部的霧滴覆蓋率最大,其次為棉株中部,棉株下部的最低。與不添加助劑的G處理相比,F(xiàn)、B、A和E處理下棉株上部的霧滴覆蓋率分別顯著增加57.1%、42.9%、33.3%和33.33%;A、B、E和F處理下棉株中部的霧滴覆蓋率顯著增加,其中處理F的霧滴覆蓋率最高,為2.2%;F、B、A和E處理下棉株下部的霧滴覆蓋率分別顯著增加85.7%、57.1%、57.1%和42.9%。

        2.1.4 助劑對(duì)霧滴沉積量的影響。不同處理下棉株上部、中部和下部霧滴沉積量的變化范圍為0.049~0.667 μL·cm-2。與不添加助劑的G處理相比,A、B、E和F處理下棉株上部的霧滴沉積量分別顯著增加40.4%、68.4%、33.84%和70.96%;B、E和F處理下棉株中部的霧滴沉積量分別顯著增加57.1%、43.9%和59.9%;B和F處理下棉株下部的霧滴沉積量分別顯著增加208.2%和259.2%(圖5)。

        2.2 助劑對(duì)植保無人機(jī)噴施作業(yè)防治棉蚜效果的影響

        由圖6可知,A~F處理在藥后1 d、3 d、7 d和14 d對(duì)棉蚜的防效均高于G處理。

        施藥后1 d,A、B、E和F處理下棉株上部、中部和下部的防效均顯著高于G處理,其中F處理對(duì)棉株上部、中部和下部棉蚜的防效均最高,分別為58.8%、49.6%和39.8%,顯著高于其他6個(gè)處理,B處理次之。

        施藥后3 d,A~F處理對(duì)棉株上部、中部和下部棉蚜的防效均顯著高于G處理。A~F處理對(duì)棉株上部、中部和下部棉蚜的防效分別為65.0%~76.8%、52.9%~66.4%和48.5%~55.5%。其中,F(xiàn)處理對(duì)棉株上部、中部和下部棉蚜的防效均最高,B處理次之。

        施藥后7 d,A~F處理對(duì)棉株上部、中部和下部棉蚜的防效分別為82.3%~92.2%、71.5~83.0%和62.2%~74.0%。A~F處理對(duì)棉株上部和中部棉蚜的防效均顯著高于G處理。除了D處理,其他處理對(duì)棉株下部棉蚜的防效均顯著高于G處理。F處理對(duì)棉株上部、中部和下部棉蚜的防效均最高,B處理次之。

        施藥后14 d,A~G處理對(duì)棉株上部、中部和下部棉蚜的防效均有所下降,但A~F處理對(duì)棉株上部、中部和下部棉蚜的防效仍顯著高于G處理。以上結(jié)果表明,在39%螺蟲·噻嗪酮SC用量相同的情況下,添加助劑對(duì)棉蚜的防效均高于不添加助劑的G處理,其中添加倍倍加和倍達(dá)通處理(F和B處理)的防效較優(yōu)。

        3 討論

        植保無人機(jī)施藥具有作業(yè)效率高、對(duì)作物無機(jī)械損傷、人機(jī)分離可避免作業(yè)人員農(nóng)藥中毒等優(yōu)勢,已廣泛應(yīng)用于作物病蟲草害防治。近年來在新疆棉田蚜蟲防治中,植保無人機(jī)防治的理論和技術(shù)備受關(guān)注。前人研究報(bào)道了植保無人機(jī)防治棉蚜的作業(yè)參數(shù)和藥劑篩選[13-14],助劑對(duì)植保無人機(jī)噴施藥液的霧滴沉積特性和防效的影響[15],篩選出一批適合無人機(jī)噴霧防治棉蚜的藥劑和助劑[16-17],對(duì)比了無人機(jī)白天和夜間作業(yè)條件下棉株不同部位的霧滴沉積規(guī)律及棉蚜防效[31],優(yōu)化了植保無人機(jī)防治棉蚜的作業(yè)參數(shù)[32],為植保無人機(jī)在新疆棉田的應(yīng)用與推廣提供了科學(xué)依據(jù)。

        助劑不僅能改變藥劑的理化特性,還對(duì)霧滴的沉積特性產(chǎn)生影響[33-34]。本研究中在田間開展噴霧試驗(yàn),結(jié)果表明添加助劑牙克透、倍達(dá)通、植物三餐、農(nóng)健飛、奇功和倍倍加均可以提高棉株上部、中部和下部葉片的霧滴覆蓋率、霧滴密度和霧滴沉積量,從而增強(qiáng)對(duì)棉蚜的防效。在供試的6種助劑中,倍倍加和倍達(dá)通的作用效果較好。蘭玉彬等[22]的研究結(jié)果也表明,添加助劑可對(duì)藥液的霧滴沉積特性產(chǎn)生影響,其中添加倍達(dá)通增加了霧滴粒徑和沉積量,這與本研究的結(jié)果相同。添加倍倍加和倍達(dá)通后藥液的沉積特性均有所改善,這與添加助劑后霧滴的抗飄移、抗蒸發(fā)性增強(qiáng)有關(guān)[35]。

        合理地添加助劑可增加藥液霧滴的粒徑,降低霧滴表面張力,提高霧滴的鋪展系數(shù)和藥液的黏度,起到降低藥劑使用量并提高藥效的作用[22-36]。本研究表明,供試6種助劑對(duì)39%螺蟲·噻嗪酮SC均有一定程度的增效作用,在39%螺蟲·噻嗪酮SC用量相同的情況下,分別添加牙克透、倍達(dá)通、奇功和倍倍加這4種助劑對(duì)棉蚜的防效均顯著優(yōu)于不添加助劑的對(duì)照處理,添加倍倍加處理對(duì)棉蚜的防效最優(yōu),添加倍達(dá)通處理的防效次之。

        4 結(jié)論

        無人機(jī)噴施條件下,添加助劑牙克透、倍達(dá)通、植物三餐、農(nóng)健飛、奇功和倍倍加影響39%螺蟲·噻嗪酮懸浮劑在棉花葉片上的霧滴沉積特性,提高藥劑對(duì)棉蚜的防效。在供試的助劑中,添加倍倍加和倍達(dá)通能顯著增加棉株上部、中部和下部葉片上的霧滴覆蓋率、霧滴密度和霧滴沉積量,能明顯增大霧滴粒徑,顯著提高藥后1 d、3 d、7 d和14 d對(duì)棉蚜的防效,對(duì)39%螺蟲·噻嗪酮懸浮劑防治棉蚜具有很好的增效作用。

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        (責(zé)任編輯:王小璐" " 責(zé)任校對(duì):王國鑫)" " ●

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