Abstract
The sweetpotato whitefly, Bemisia tabaci (Gennadius) (Hemiptera: Aleyrodidae), is a major insect pest of poinsettias (Euphorbia pulcherrima Willd. ex Klotzsch; Family: Euphorbiaceae) in the greenhouse. Currently, neonicotinoids are widely used for B.tabaci management in the greenhouse, which is less favored by the consumers because of the potential nontarget effects of these insecticides on beneficial insects. Little is known on how the high spray volumes of spinetoram (20%) + sulfoxaflor (20%) (XXpire®) affect the B.tabaci population in the greenhouse. The objective of the study was to determine the efficacy of spinetoram + sulfoxaflor and dinotefuran (Zylam®) applied as foliar-spray volumes (high, referred to as spench, and low, referred to as foliar) and soil drench against B.tabaci. The high foliar-spray volume application (spench) of both insecticides reduced the B.tabaci immature densities, compared with low foliar-spray volume (foliar) and soil drench applications. The soil drench application did not provide adequate B.tabaci control regardless of insecticide type. Spinetoram + sulfoxaflor applied as a high-spray volume treatment was moderately effective in controlling B.tabaci nymphs relative to nontreated control.
Highlights
Aleyrodidae) in the Greenhouse.The sweetpotato whitefly, Bemisia tabaci (Gennadius) (Hemiptera: Aleyrodidae), is a serious insect pest of many ornamental plants, including poinsettias (Euphorbia pulcherrimaWilld. ex Klotzsch; Family: Euphorbiaceae)) in the greenhouse [1]
The exact reason for this result is unclear, it is most likely due improved spray coverage on the foliage or improved translaminar movement when using to improved spray coverage on the foliage or improved translaminar movement when a nozzle tip that discharged more insecticide solution than the nozzle tip that discharged using a nozzle tip that discharged more insecticide solution than the nozzle tip that disless insecticide solution
The results indicated that higher foliar spray volume effectively reduced nymphal densities of B. tabaci even at a low XXpire rate, 140.1 g/ha
Summary
Aleyrodidae) in the Greenhouse.The sweetpotato whitefly, Bemisia tabaci (Gennadius) (Hemiptera: Aleyrodidae), is a serious insect pest of many ornamental plants, including poinsettias (Euphorbia pulcherrimaWilld. ex Klotzsch; Family: Euphorbiaceae)) in the greenhouse [1]. The sweetpotato whitefly, Bemisia tabaci (Gennadius) (Hemiptera: Aleyrodidae), is a serious insect pest of many ornamental plants, including poinsettias Ex Klotzsch; Family: Euphorbiaceae)) in the greenhouse [1]. In 2019, the potted poinsettias were valued at USD 215.9 million, and 46.8 million potted plants were sold in the US [2], which includes both wholesale and retail markets. Poinsettias are the leading crop and represent 20.9% of potted flower plants sold. All immatures and adult stages of B. tabaci directly feed on the foliage of poinsettias, and the feeding causes injury symptoms, such as wilting, yellowing, and mottling [1]. The B. tabaci infestation is unacceptable, as it affects the aesthetic value and salability of the potted poinsettias
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