Beating the Wheat Nematode Quiz Quiz

Explore effective nematode management strategies for wheat and other agricultural crops. This quiz covers identification, impact, and control methods for plant-parasitic nematodes in the field.

1. Identifying Wheat Nematode Damage

   Which visible symptom most commonly indicates wheat nematode infestation in a growing wheat field?

   1. Gray mold on stems
   2. Stunted patchy plant growth
   3. Wilted leaf edges
   4. Leaf blight spots

   Explanation: Stunted patchy plant growth is a classic sign of nematode activity, as they damage root systems causing uneven or poor plant development. Leaf blight spots are typically caused by fungi. Gray mold on stems is usually due to fungal pathogens such as Botrytis. Wilted leaf edges may indicate water stress or certain leaf diseases, not nematodes.

2. Biological Nematode Control

   Which of the following is an example of a biological control method for nematode management in agriculture?

   1. Applying predatory fungi
   2. Using herbicides
   3. Tilling soil frequently
   4. Over-irrigating fields

   Explanation: Predatory fungi that parasitize or trap nematodes are a biological control, harnessing natural enemies. Frequent tilling may disrupt nematode life cycles but is not biological. Herbicides target weeds, not nematodes. Over-irrigation can worsen nematode problems and is not a control strategy.

3. Crop Rotation in Nematode Management

   Why is crop rotation recommended for managing cereal cyst nematodes in wheat fields?

   1. Improves germination rates by loosening soil
   2. Increases wheat yield by enriching soil nitrogen
   3. Reduces nematode populations by alternating non-host crops
   4. Prevents erosion through continuous ground cover

   Explanation: Rotating with non-host crops interrupts the nematode life cycle, reducing their numbers. While crop rotation can have other benefits, such as improving soil health, increasing yield and erosion prevention are indirect benefits, not the main reason for targeting nematodes. Improved germination is not the primary outcome.

4. Chemical Nematicide Usage

   Which important precaution should be taken when applying chemical nematicides to wheat fields?

   1. Water immediately after chemical dries
   2. Apply only during midday sunlight
   3. Mix with extra fertilizer for better results
   4. Follow labeled rates and safety guidelines

   Explanation: Using nematicides safely requires following the product label for application rates and safety instructions to avoid crop harm and environmental damage. Mixing with fertilizer is not recommended unless specified. Midday application may increase volatilization and risk. Immediate watering isn't universally required and depends on the product.

5. Resistant Wheat Varieties

   How do resistant wheat varieties help manage nematode infestations in agriculture?

   1. Accelerate nematode egg hatch
   2. Attract pest predators to the field
   3. Increase field water retention
   4. Prevent nematode reproduction in roots

   Explanation: Resistant varieties block or reduce nematode reproduction, limiting their population growth. Improved water retention is not related to nematode resistance. Accelerated egg hatch would worsen infestations. Attracting predators helps, but resistance specifically refers to genetic protection in the plant.