Glyphosate on Tomato and Sweet Pepper Yields

Semidey, Nelson; Almodóvar, Luis

doi:10.46429/jaupr.v71i2.6948

Cited by 4 publications

(4 citation statements)

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“…They found that shielded sprays of 0.8 to 1.6% v/v glyphosate isopropylamine salt between rows of pepper plants induced no symptoms of phytotoxicity and that pepper yields were equivalent to yield of the handweeded check. In the same study, tomato yields were less than that of the check, although no foliar injury symptoms were observed (Semidey and Almodóver 1987). Other apparent incidences of soil residues of glyphosate that were phytotoxic to tomato have been reported where soils were comprised of greater than 80% sand (Cornish 1992;Eberbach and Douglas 1983).…”

Section: Introductionmentioning

confidence: 70%

“…Less phytotoxicity and less accumulation of fresh weight occurred in response to glyphosate by potato plants grown under a low-temperature regime compared with plants grown at higher temperatures, and the discrepancy was attributed to reduced glyphosate uptake at low temperatures (Masiunas and Weller 1988). The previous study with pepper by Semidey and Almodóver (1987) was conducted for just one season. Exposure to glyphosate was thought to occur via the root system since the sprays were shielded and directed between rows to ensure that spray drift did not occur.…”

Section: Introductionmentioning

confidence: 96%

“…Information on the effects of glyphosate on pepper yield is limited to the work of Semidey and Almodóver (1987). They found that shielded sprays of 0.8 to 1.6% v/v glyphosate isopropylamine salt between rows of pepper plants induced no symptoms of phytotoxicity and that pepper yields were equivalent to yield of the handweeded check.…”

Section: Introductionmentioning

confidence: 99%

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Phytotoxic Effects of Glyphosate on Pepper (Capsicum annuum)¹

Gilreath¹,

Chase²,

Locascio³

2000

Weed Technology

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Glyphosate was applied to pepper as single or sequential applications to assess the consequences of drift or other accidental exposures. Foliar injury increased and plant vigor declined with increased rates of glyphosate and were exacerbated by a second application. Single applications at flowering (stage 1) were more damaging than single applications after fruit set (stage 2). Decline in marketable yield with increased glyphosate rate was greater with stage 1 applications, except in spring 1987 when marketable yields with single applications of glyphosate at stage 1 or stage 2 were statistically similar. Sequential applications resulted in the lowest marketable yields. Total yields declined with increased glyphosate rate and decline was more pronounced with sequential applications than with single applications. Total yield was affected to a greater extent when glyphosate was applied at stage 1 than at stage 2. Yield was more sensitive to two successive exposures than to single applications. Mean fruit weight was reduced by glyphosate in two of the four experiments.

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Section: Introductionmentioning

confidence: 70%

Section: Introductionmentioning

confidence: 96%

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Phytotoxic Effects of Glyphosate on Pepper (Capsicum annuum)¹

Gilreath¹,

Chase²,

Locascio³

2000

Weed Technology

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“…Glyphosate at both 2.5 and 5.0 kg –1 reduced total head weights by 35% and 63%, respectively, when no mitigation was implemented (Table 2). Previous research indicated that glyphosate uptake through roots can reduce vegetable yields (Semidey and Almodóvar 1987). The number of broccoli heads produced was reduced by glyphosate only at 5.0 kg ha –1 (56%), indicating that the impact from glyphosate, especially at the lower rate, was predominately through reducing head size (data not shown).…”

Section: Resultsmentioning

confidence: 99%

Transplant broccoli and collard response to the residual activity of glyphosate applied preplant

et al. 2023

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Cole crops including broccoli and collard contribute over $119 million to Georgia’s farm gate value yearly. To ensure maximum profitability, these crops must be planted into weed-free fields. Glyphosate is a tool often used to help achieve this goal because of its broad-spectrum activity on weeds coupled with the knowledge that it poses no threat to the succeeding crop when used as directed. However, recent research suggests that with certain soil textures and production systems, the residual soil activity of glyphosate may damage some crops. Therefore, field experiments were conducted in the fall of 2019 and 2020 to evaluate transplanted broccoli and collard response to glyphosate applied preplant onto bare soil and what practical mitigation measures could be implemented to reduce crop injury. Herbicide treatments consisted of 0, 2.5, or 5 kg ae ha-1 glyphosate applied preplant followed by 1) no mitigation measure, 2) tillage, 3) irrigation, or 4) tillage and irrigation prior to transplanting broccoli and collard by hand. When no mitigation was implemented, the residual activity of glyphosate at 2.5 and 5.0 kg ae ha-1 resulted in 43 to 71% and 79 to 93% injury to broccoli and collard transplants, respectively. This resulted in a 35 to 50% reduction in broccoli marketable head weights and 63 to 71% reduction in collard leaf weights. Irrigation reduced visible damage 28 to 48% while tillage reduced injury 43 to 76%, for both crops. Irrigation alleviated yield losses for broccoli but only tillage eliminated yield loss for both crops. Care must be taken when transplanting broccoli and collard into a field recently treated with glyphosate at rates ≥ 2.5 kg ae ha-1. Its residual activity can damage transplants with injury levels influenced by glyphosate rate, and tillage or irrigation after application and prior to planting.

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