Main weeds in soybean crops: identification and control

The presence of plants weeds in soybean crops can be a significant challenge to soil productivity and health.

These invasive weeds compete with soybeans for nutrients, water and light, harming the growth and quality of the crop.

Additionally, some can act as hosts for diseases and pests, further exacerbating the problems faced by farmers.

In this article, we will explore the main weeds in soybean crops, providing detailed information about each one and effective control strategies.

So, be sure to follow along!

What are the losses caused by weeds in soybean crops?

Weeds are more than just a nuisance in soybean crops; they pose a serious challenge to agricultural productivity.

By competing with soybeans for vital resources, these weeds reduce crop yields and increase management costs.

Weeds can compromise grain quality by reducing the soybean leaf area, which is essential for photosynthesis.

Furthermore, they can prevent the effective application of herbicides, increasing the resistance and persistence of invasive weeds.

Another important consequence is the degradation of soil structure. Many weeds have extensive root systems that can affect soil compaction and water availability.

This negative impact can result in less fertile soil that is more susceptible to erosion, affecting long-term productivity.

According to the Embrapa, a significant infestation can reduce soybean yield by up to 30%, which highlights the importance of effective control.

1. Horseweed (Conyza spp.)

Buva, or Conyza spp., is one of the most problematic weeds in soybean crops. Characterized by its rapid growth and high seed dispersal capacity, Buva can dominate large areas of the crop in a short period of time.

Its resistance to many herbicides, such as photosynthesis inhibitors, makes controlling this weed especially challenging.

Buva stands out for its ability to germinate in a wide range of conditions and its rapid life cycle, which allows it to produce several generations of seeds in a single season.

To manage Buva, it is crucial to adopt an integrated approach that includes the rotation of herbicides with different mechanisms of action, cultural management practices and manual control.

The use of techniques such as the application of herbicides at the young seedling stage and early control is essential to limit the spread of this plant.

2. Dog Parsley (Amaranthus palmeri)

Dog parsley, or Amaranthus palmeri, is known for its herbicide resistance and vigorous growth.

This weed can reach significant heights and produce a large quantity of seeds, which are easily dispersed by the wind.

Parsley also has a remarkable ability to compete with soybeans for resources, making it a significant threat to crop productivity.

To control this plant, the application of herbicides with different modes of action is essential. Choosing herbicides that act at specific stages of the plant's life cycle, combined with cultural management practices, can help control this invasive weed.

The practice of cultivating resistant soybeans and integrating manual control methods are also effective strategies.

Maintaining good soil cover and using cover crops can also help reduce competition from Dog Parsley.

3. Hairy (Mimosa pudica)

Mimosa pudica, or Mimosa pudica, is a weed that can be particularly difficult to control due to its ability to propagate through stolons and seeds.

Its sensitive leaves and tendency to spread rapidly make Cabeludinha a significant threat to soybeans.

The plant also has a rapid germination capacity, which facilitates its spread.

Cabeludinha can be controlled by applying selective herbicides and using manual control techniques, such as removing young plants before they become established.

Mulching the soil and using high-competition soybean varieties are also effective. For more efficient control, it is recommended to integrate management methods such as crop rotation and the application of herbicides with different modes of action, to prevent resistance.

4. Trapoeraba (Commelina benghalensis)

Spiderwort, or Commelina benghalensis, is a creeping weed that spreads rapidly and can form dense mats that compete directly with soybeans for resources.

Its horizontal growth and ability to cover the ground make controlling this plant a significant challenge.

Spiderwort can create a shady environment that limits soybean growth and can be an obstacle to harvesting.

For the management of Trapoeraba, it is recommended to apply specific herbicides for creeping plants and to adopt cultivation practices that promote adequate soil coverage.

Crop rotation and the use of resistant soybean varieties can also help manage this weed.

Practices such as adequate fertilization and maintaining good soil structure are crucial to reducing competition from Trapoeraba.

5. Thistle (Bidens pilosa)

The Picão, or Bidens pilosa, is a weed that is characterized by its rapid germination and growth.

The abundant seed production and ability to spread easily make thistle a persistent problem in many soybean crops.

The plant has the ability to adapt to different soil and climate conditions, making its control even more challenging.

To control Picão, it is important to use herbicides that are effective against broadleaf plants and implement integrated management practices, such as crop rotation and manual control.

Applying pre-emergent herbicides can also help prevent seed germination.

Furthermore, the use of techniques such as soil cover and soybean cultivation with good competition can minimize Picão infestation and improve overall productivity.

Control and management strategies

The effective management of weeds in soybean crops requires an integrated approach that combines several strategies.

For example, herbicide rotation, use of resistant varieties and cultural management practices are essential for sustainable control of these weeds.

Integrating manual control techniques and adopting cultivation practices that minimize seed dispersal are also essential to keeping crops healthy and productive.

Additionally, the use of preventive control methods, such as the application of pre-emergent herbicides and the maintenance of adequate soil cover, can be effective in reducing weed infestation.

Continuous crop monitoring and implementation of adaptive management strategies are crucial to address the weed challenge sustainably and efficiently.

Relevant data and research

According to a study by Embrapa, the presence of uncontrolled weeds can reduce soybean yield by up to 30%.

The research also highlights that integrated management, which includes herbicide rotation and manual control, is an effective approach to reducing weed infestation and improving crop productivity.

These data reinforce the need for a well-structured management plan to effectively address weed challenges.

Table: comparison of the main weeds in soybean crops

FAQ

1. How to identify weeds in soybean crops?

Weeds can be identified by their appearance and behavior, such as rapid growth, competition for resources, and resistance to herbicides.

Therefore, consulting identification guides and carrying out regular inspections of the crop can help with early identification.

Checking for signs such as mat formation or uncontrolled growth may indicate the presence of weeds.

2. What is the best strategy for controlling resistant weeds?

To control resistant weeds, it is recommended to use herbicides with different modes of action, adopt integrated management practices and carry out crop rotation.

Manual control may also be necessary in severe cases. In addition, integrating cultural practices such as ground cover and cultivation of resistant varieties is effective in minimizing resistance.

3. What are the consequences of a significant weed infestation?

A significant infestation can reduce crop yields by up to 30%, compromise grain quality and cause soil degradation.

Weeds can also act as hosts for diseases and pests, exacerbating problems and increasing management costs.

Implementing effective control strategies is essential to avoid these consequences.

Written by Nara

I think, therefore I write! Content Writer, Compliance Analyst, and SEO Editor | Over 7 years of experience. As an introvert, I discovered that writing is the perfect way to connect, engage, and communicate with others. I deeply believe in the power of words; for me, transforming complex concepts into accessible content is a simple act of inclusion. I specialize in transforming Finance, Credit, and digital world topics into clear, search engine optimized (SEO) content that brings brands closer to their audiences. My experience is backed by certifications from leading market references: ANBIMA, Rock Content, and HubSpot.

Updated on August 11, 2024