Dynamics of Tetranychus urticae Koch (Acari: Tetranychidae) in the Presence of the Predatory Mite Neoseiulus californicus (McGregor) (Acari: Phytoseiidae) in Cotton Under Semi-field Conditions.

IF 1.4 3区农林科学 Q2 ENTOMOLOGY

Neotropical Entomology Pub Date : 2025-05-06 DOI:10.1007/s13744-025-01276-4

Mariana Yamada, Gabryele S Ramos, Alexandre S Araújo, Leonardo V Thiesen, Fernando H Iost Filho, Pedro T Yamamoto

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Abstract

Tetranychus urticae Koch is a major pest in cotton crops; in Brazil, the predatory mite Neoseiulus californicus (McGregor) is used for its biological control. Although the standard recommendation for controlling T. urticae is to release around 20,000 individuals per hectare, this is a general guideline and may not be suitable for cotton crops. The present study examined the effect of N. californicus on T. urticae populations in semi-field conditions to identify the predator density needed to reduce pest infestation and the percentage of infested plants. We tested predator-to-prey ratios of 0:50, 3:50, 5:50, and 10:50 on cotton plants maintained in a greenhouse. Tetranychus urticae individuals and the proportion of infested plants were counted daily for the first 5 days, then every 3 days until day 29. All tested densities of N. californicus reduced T. urticae infestation; however, only the release of 5 or 10 predators per 50 T. urticae individuals resulted in infestation levels below the economic threshold level (ETL) recommended for controlling the two-spotted spider mite in cotton crops.

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半田条件下加州新绥螨（蜱螨目：植物绥螨科）在棉花上的动态变化

棉花叶螨是棉花的主要害虫；在巴西，捕食性螨加利福尼亚新绥螨（McGregor）被用于其生物防治。虽然控制荨麻疹的标准建议是每公顷释放约20,000只，但这是一般指导方针，可能不适合棉花作物。本研究在半田间条件下考察了加州新蚊对荨麻虱种群的影响，以确定减少害虫侵害所需的捕食者密度和受侵染植物的百分比。我们在温室里的棉花上测试了0:50、3:50、5:50和10:50的捕食者与猎物的比例。前5 d每天计数荨叶螨个体数和侵染植株比例，之后每3 d计数一次，直至第29 d。加州新尼蚊的所有测试密度都减少了荨麻疹的侵扰；然而，每50只荨麻疹螨释放5或10只捕食者，其侵染水平低于控制棉花双斑蜘蛛螨的经济阈值水平。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Neotropical Entomology 生物-昆虫学

CiteScore

3.30

自引率

5.60%

发文量

审稿时长

6-12 weeks

期刊介绍： Neotropical Entomology is a bimonthly journal, edited by the Sociedade Entomológica do Brasil (Entomological Society of Brazil) that publishes original articles produced by Brazilian and international experts in several subspecialties of entomology. These include bionomics, systematics, morphology, physiology, behavior, ecology, biological control, crop protection and acarology.