Sugarcane Weed Warriors Quiz Quiz

Challenge your knowledge on effective weed management strategies in sugarcane fields, exploring best practices, integrated control methods, and major weed species encountered in agriculture.

1. Identifying Problem Weeds in Sugarcane

   Which of the following is a commonly found problematic weed in sugarcane fields that significantly reduces yield if not managed?

   1. Lolium perenne
   2. Trifolium repens
   3. Brassica napus
   4. Cyperus rotundus

   Explanation: Cyperus rotundus, also known as purple nut sedge, is notorious for its aggressive growth and competitiveness against sugarcane. Brassica napus (canola) and Trifolium repens (white clover) are generally not problematic in sugarcane systems. Lolium perenne (perennial ryegrass) is more common in temperate pastures than sugarcane plantations.

2. Advantages of Mulching

   What is a primary advantage of using organic mulches for weed management in sugarcane cultivation?

   1. Decreases soil moisture retention
   2. Increases pest infestations
   3. Raises the need for frequent tillage
   4. Suppresses weed seed germination by blocking sunlight

   Explanation: Organic mulches limit sunlight, making it difficult for many weed seeds to germinate and grow. Mulching usually reduces pests and increases soil moisture retention rather than decreasing it. It also minimizes the need for tillage by maintaining ground cover.

3. Timing of Herbicide Application

   When is the most effective time to apply pre-emergence herbicides in newly planted sugarcane fields?

   1. When weeds are fully mature
   2. Immediately after planting, before weed seedlings appear
   3. After harvesting the sugarcane
   4. During full crop canopy development

   Explanation: Applying pre-emergence herbicides right after planting prevents weed seeds from establishing. Applying during full canopy or after harvest is less effective, as weeds may already be present. Treating mature weeds with pre-emergence herbicides is usually ineffective.

4. Integrated Weed Management Approaches

   Which approach best describes Integrated Weed Management (IWM) in sugarcane farming?

   1. Relying solely on hand-weeding
   2. Depending entirely on biological control
   3. Using only chemical herbicides
   4. Combining cultural, mechanical, and chemical methods

   Explanation: IWM means combining strategies—such as crop rotation, tillage, timely herbicide use, and manual removal—for sustainable results. Reliance on just one method (chemical, hand-weeding, or biological) is less sustainable and often less effective over time.

5. Weed Competition and Sugarcane Yield

   How does early-season weed competition generally affect sugarcane growth and yield?

   1. It has no effect if controlled after 6 months
   2. It improves sugar content in the canes
   3. It significantly reduces plant vigor and final yield
   4. It only increases disease incidence without yield effect

   Explanation: Early-season weeds compete with young sugarcane for water, nutrients, and light, harming crop vigor and reducing yields. Delayed control often fails to recover losses. Contrary to one option, early weed competition does not improve sugar content or only affect disease incidence alone.