01  Beginning of seed imbibition

03 Seed imbibition complete
05 Radicle emerged from seed
07 Hypocotyl with cotyledons breaking through seed coat 

09 Emergence: cotyledons break through soil surface.

Observations :- Emergence of seedlings from the soil. Cotyledons (seed leaves) are visible.

Crop Condition :- Good

Days :- 10-14

Date :- 18-05-2024

10  Cotyledons completely unfolded; growing point or true leaf initial visible

11  First true leaf unfolded

12  2nd true leaf unfolded

13  3rd true leaf unfolded

1. Stages continuous till . . .
19 9 or more true leaves unfolded

Observation Note: The first set of true leaves appear, followed by subsequent leaves, The first true leaf is fully unfolded. This marks the beginning of the main shoot development, The second true leaf is fully unfolded. The plant is now developing additional true leaves, The third true leaf is fully unfolded. The plant continues to grow and develop more leaves.

Crop Condition :- Good

Days :- 15-30

date :- 30-05-2024

Identification Signs of Cabbage White Butterfly (Pieris brassicae) in White Cabbage

1. Eggs:

   • Small, yellow, and oval-shaped.

   • Laid singly or in clusters on the underside of leaves.

2. Caterpillars:

   • Green with faint yellow stripes along their bodies.

   • Covered in fine, short hairs.

   • Typically found feeding on the underside of leaves, creating irregular holes.

3. Adults:

   • White wings with black tips on the forewings.

   • Females have two black spots on each forewing; males have one.

   • Often seen fluttering around cabbage plants during the day.

4. Damage:

   • Irregular holes in leaves caused by caterpillar feeding.

   • Frass (caterpillar droppings) on and around damaged leaves.

   • Severe infestations can result in skeletonized leaves and stunted plant growth.

Integrated Pest Management (IPM) for Cabbage White Butterfly (Pieris brassicae)

1. Cultural Control

   • Crop Rotation: Rotate cabbage with non-host crops.

   • Intercropping: Plant with tomatoes, celery, or sage.

   • Physical Barriers: Use row covers or fine mesh netting.

   • Timely Planting: Adjust planting times to avoid peak butterfly activity.

     2. Biological Control

     • Parasitoid Wasps (Trichogramma spp.): Lay eggs in butterfly eggs, preventing hatching.

     • Predatory Insects: Ladybugs and lacewings control caterpillar populations.

     • Birds: Encourage by providing birdhouses and a diverse landscape.

     • Bacillus thuringiensis (Bt): Apply Bt to foliage for caterpillar ingestion.

     3. Chemical Control

     • Selective Insecticides:

       • Spinosad: Effective against caterpillars; safe for beneficial insects.

       • Neem Oil: Disrupts insect growth and feeding

     
     

Identification Signs of Downy Mildew (Hyaloperonospora brassicae) in White Cabbage

1. Leaf Spots:

   • Yellow or pale green irregular spots on the upper surface of leaves.

   • Spots may turn brown or necrotic over time.

2. Fungal Growth:

   • White to grayish fungal growth on the underside of leaves, directly beneath the yellow spots.

   • Growth is more visible in humid or wet conditions.

3. Leaf Distortion:

   • Affected leaves may become distorted, curled, or stunted.

   • Severe infections can lead to leaf drop.

4. Reduced Vigor:

   • Plants may exhibit overall reduced growth and vigor.

   • Severe infestations can impact head formation and quality.

Integrated Pest Management (IPM) for Downy Mildew (Hyaloperonospora brassicae) in White Cabbage

Cultural Control

1. Crop Rotation:

   • Rotate cabbage with non-host crops to prevent disease buildup in the soil.

2. Resistant Varieties:

   • Plant resistant or tolerant cabbage varieties if available.

   Biological Control

   1. Biological Fungicides:

      • Use biological fungicides containing beneficial microbes like Bacillus subtilis, which can suppress downy mildew.

   Chemical Control

   1. Fungicides:

      • Apply fungicides preventatively, especially during favorable conditions for disease development (cool, wet weather).

      • Rotate fungicides with different modes of action to prevent resistance development. Effective fungicides include those containing copper, mancozeb, or metalaxyl.