Faculdade de Agronomia e Medicina Veterinária, Universidade de Brasília, Brasília, Brazil.
Centro de Ciências da Natureza, Universidade Federal de São Carlos, São Paulo, Brazil.
Pest Manag Sci. 2022 Jun;78(6):2492-2501. doi: 10.1002/ps.6880. Epub 2022 Apr 9.
Knowledge of the spatio-temporal distribution of pests is important for the development of accurate management approaches. The boll weevil, Anthonomus grandis grandis Boh., is a deleterious cotton, Gossypium hirsutum L., pest in the western hemisphere. The spread of boll weevils across cotton fields remains poorly understood. We assessed the dispersal pattern of adult weevils through cotton fields cultivated in a tropical area during dry and wet seasons using geostatistics for the number of adults and infested reproductive structures (buds, bolls and total).
Adult weevils and infested reproductive structures increased across both seasons despite the prevailing climatic variables. In both seasons, boll weevil adults and infested reproductive structures followed an aggregated distribution. The distances over which samples maintained spatial dependence varied from 0.7 to 43.4 m in the dry season and from 6.0 to 614.4 m in the wet season. Boll weevil infestations started at field borders and the infested reproductive structures (oviposition and/or feeding punctured) were greater than the adults regardless of cotton growth stage.
Sampling for boll weevils in cotton fields should start at the field borders and focus on total infested reproductive structures (buds + bolls) and as cotton plants develop, sampling should focus on the field as a whole. Distances among samples will vary from 6 to 470 m. Thus, despite the cotton phenological stage or growing season, monitoring of boll weevil should be done by sampling total infested reproductive structures with a minimum distance of 6 m among samples. © 2022 Society of Chemical Industry.
了解害虫的时空分布对于制定准确的管理措施非常重要。棉铃象甲，Anthonomus grandis grandis Boh.，是西半球棉花，Gossypium hirsutum L. 的有害害虫。棉铃象甲在棉田中的传播仍知之甚少。我们使用地统计学评估了在干季和湿季在热带地区种植的棉花田中，成虫的扩散模式，用成虫和受侵染的生殖结构（花蕾、棉铃和总数）的数量进行评估。
尽管存在主要气候变量，但在两个季节中，成虫和受侵染的生殖结构的数量都在增加。在两个季节中，棉铃象甲成虫和受侵染的生殖结构都呈聚集分布。在干季，样本保持空间依赖性的距离从 0.7 到 43.4 m 不等，在湿季，从 6.0 到 614.4 m 不等。棉铃象甲的侵染始于田间边界，受侵染的生殖结构（产卵和/或取食造成的刺伤）大于成虫，而与棉花生长阶段无关。
在棉花田中采集棉铃象甲时，应从田间边界开始，重点采集受侵染的生殖结构（花蕾+棉铃），随着棉花植株的生长，采样应集中在整个田地。样本之间的距离将在 6 到 470 m 之间变化。因此，尽管棉花物候期或生长季节不同，监测棉铃象甲都应通过采集受侵染的生殖结构总数来进行，样本之间的最小距离为 6 m。 © 2022 化学工业学会。
