Effects of the different periods of weed interference on lettuce in protected cultivation

Nascimento, ldon Rodrigues; Barreto, Horllys Gomes; Chaves, Prínscilla Pâmela Nunes; Erasmo, Eduardo Andrea Lemus; Momenté, Valéria Gomes

doi:10.5935/paet.v6.n2.08

Cited by 2 publications

(2 citation statements)

References 11 publications

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“…The few studies that have reported on the critical period of weed interference in lettuce indicate that weed control in just the first couple of weeks after crop transplanting is crucial to avoid yield loss [3,15,16]. These studies provide valuable information regarding agronomic and economic aspects, but they do not investigate other positive externalities possibly related to optimizing weed control.…”

Section: Introductionmentioning

confidence: 99%

Minimal Necessary Weed Control Does Not Increase Weed-Mediated Biological Pest Control in Romaine Lettuce (Lactuca sativa L., var. Romana)

Virili

Moonen

2022

Horticulturae

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Lettuce is one of the most consumed leafy greens. Depending on the variety, it is ready for harvesting 40–80 days after sowing, and therefore several growth cycles can be concluded within a growing season. Due to its high market standards, lettuce may require intensive management. This study implemented a critical period of weed interference (CPWI) trial to understand at which moment of the cropping cycle weeds can be tolerated without impacting crop yield to decrease the time needed for weeding and assess the potential support weeds can give to biological pest control in lettuce. Treatments represented two gradients of weed intensity: (1) increasingly weed-free, and (2) increasingly weedy. Dose–response curves were produced to find the CPWI based on lettuce relative yield. RLQ analysis was used to explore the relationships between weeding regime and weed functional traits for biological pest control. Yield was above the 5% acceptable yield loss threshold in all plots kept weed-free for 20 days or more, indicating a necessary weed-free period of 20 days from transplanting. However, the support of beneficial insects was not guaranteed at the end of the necessary weed-free period. We suggest that it is possible to limit intense weed management to the beginning of the growing season, reducing the cost of plastic mulches and increasing on-farm biodiversity, but field margins could be better suited to deliver conservation biological control in short-term crops where this service is of primary interest.

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Section: Introductionmentioning

confidence: 99%

Minimal Necessary Weed Control Does Not Increase Weed-Mediated Biological Pest Control in Romaine Lettuce (Lactuca sativa L., var. Romana)

Virili

Moonen

2022

Horticulturae

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“…Several weeds interfere with lettuce growth, such as: smooth pigweed (Amaranthus hybridus), jamaican crabgrass (Digitaria horizontalis), nutgrass (Cyperus rotundus), milkweed (Euphorbia heterophylla), and benghal dayflower (Commelina benghalensis) (Santos et al, 2003;Giancotti et al, 2010;Nascimento et al, 2013). Santos et al (2003) emphasized that plants of the genus Amaranthus interfere with early lettuce growth due to light interception by their taller canopy, which makes it an important genus in lettuce cultivation areas.…”

Section: Introductionmentioning

confidence: 99%

Redroot pigweed interference with lettuce crop

et al. 2020

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HIGHLIGHTS  Density of 16 plants m-2 of redroot pigweed, in the planting lines, most negatively affected lettuce growth  Cultivar Lucy Brown showed greater tolerance to coexistence with redroot pigweed plants  The cultivar Lídia was the most sensitive to the interference imposed by redroot pigweed plants ABSTRACT Background: Lettuce-production areas in Brazil are frequently infested by pigweed plants, which can interfere with production by competing for resources or releasing allelopathic compounds in the environment. Objective: The present study evaluated the effect of redroot pigweed (Amaranthus retroflexus) density and distribution on lettuce crop (Lactuca sativa L.). Methods: The cultivars Lídia, Verônica, Lucy Brown and Salad Bowl were used. After transplanting, these plants coexisted until harvest with four pigweed plants (equivalent to 16 plants m-2) located within or outside planting rows, or with one pigweed plant located at the center of the plot (4 plants m-2), as well as a control without weed. The experiment was conducted in an open and semi-controlled area, with treatments arranged in a 4x4 factorial scheme, in a completely randomized experimental design with three replicates. Evaluations included: the number of leaves, fresh matter (lettuce only), height, leaf area and dry matter of lettuce and redroot pigweed plants. Results: The coexistence with redroot pigweed caused yield losses of up to 45% for cultivar Lídia; 41% for Salad Bowl; 33% for Verônica; and 28% for Lucy Brown. Conclusions: The density of 16 plants m-2 of redroot pigweed was the one that most negatively affected the growth of the cultivars, in which the positioning in the planting lines resulted in greater interference to the crop growth. Among the cultivars tested, Lucy Brown showed greater tolerance to coexistence with redroot pigweed plants, while the cultivar Lídia was the most sensitive to the imposed interference.

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Effects of the different periods of weed interference on lettuce in protected cultivation

Cited by 2 publications

References 11 publications

Minimal Necessary Weed Control Does Not Increase Weed-Mediated Biological Pest Control in Romaine Lettuce (Lactuca sativa L., var. Romana)

Minimal Necessary Weed Control Does Not Increase Weed-Mediated Biological Pest Control in Romaine Lettuce (Lactuca sativa L., var. Romana)

Redroot pigweed interference with lettuce crop

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