Peas treatments, most common diseases and pests of this vegetable

peas pisum sativum treatments common diseases pests vegetable.jpg

The pea is an annual herbal plant, which is part of the Fabaceae family (leguminous). People plant the pea for its green pods, which are used in cooking delicious meals. It originated from Central Asia and the Middle East. Peas contain fat, sodium, potassium, carbohydrates, proteins, calcium, iron, magnesium and vitamins (A, D, C, B-12, B6). Due to its properties, peas are highly recommended for people suffering from obesity, heart diseases or joint pain.

peas pisum sativum treatments common diseases pests vegetable.jpg

Main diseases

Viruses:

Mosaic disease in pea plants caused by Pea enation mosaic virus

The affected leaves have dark-green stripes with light-green shades. These spots make the leaves have a mosaic aspect. The affected plants remain small, but have a lot of small branches and the leaves are shrunken and curly. The virus attacks a wide range of plants. These are: the broad bean, the lentil, the chickpeas, the lupines, the grass pea and the pea.

peas pisum sativum mosaic disease

Prevention and control measures:

  • Isolation from other leguminous plants
  • Planting only resilient species
  • Applying pesticides to keep aphids under control

 

 

Bacteriosis:

Pea blight, caused by Pseudomonas syringae pv pisi

The leaves located next to the ground have small, pointy spots with a wet look. The spots located on the stems are elongated, look similar to olives and tend to unite and create brown strips. Early infections can lead to wilting flowers or wilting pea pods. On all the affected areas (on a rainy season) the bacterial grows which look like a mucilaginous, yellow drop. The virus is transmitted through vectors (such as water, air, people, machinery, etc) which transport the bacterial exudate from one plant to another. The bacterial can live from one year to another through the infested seeds.

peas pisum sativum pea blight

Prevention and control measures:

  • Planting resilient species
  • Disinfecting the seeds. For more information related to methods of disinfecting the seed, click here
  • Chemical treatments using cu Champ 77 WG, Zeama bordeleza, Melody Compact 49 WG, Funguran OH 50 WP, Copernico Hi-Bio;

 

 

Mycosis:

Downy mildew on peas caused by Peronospora pisi

This disease attacks the leaves which are close to the ground, thus yellow spots appear on the front side of the leaves. On the back of the leaves, a gray fluff grows. The affected tissues get brown and wilt. Similar spots can appear on the pea pods as well. If the infection is a strong, it can affect the peas inside the pods.

peas pisum sativum downy mildew

Prevention and control measures:

  • Planting resilient species and hybrids
  • Correct crop rotation
  • Avoiding sprinkler irrigation
  • Chemical treatments, using Bravo 500 SC, Acrobat MZ 90-600 WP, Ridomil Gold MZ 68, Equation PRO, Dithane M 45;

 

 

Powdery mildew caused by Erysiphe polygoni

Powdery mildew attacks all the plant’s organs, as a soft, white layer. As the disease evolves, the layer turns dusty, then gray and after that the affected tissues die.

peas pisum sativum powdery mildew

Prevention and control measures:

  • Correct crop rotation
  • Disinfecting the seeds. For more information related to methods of disinfecting the seed, click here
  • Destroying the vegetal residue after harvestin
  • Chemical treatments, using Topas 100 EC, Kumulus DF, Ortiva 250 SC, Thiovit Jet 80 WG, Systhane Plus 24 E;

Ascochyta blight on peas caused by Mycosphaerella pinodes

The leaves get brown spots, with black dots in the center. The pea pods also get these spots, spots which are shrunken and with dark colored margins. The attacked peas get coffee colored spots, with a wrinkled skin. The disease might attack the stems as well.

peas pisum sativum ascochyta blight

Prevention and control measures:

  • Correct crop rotation
  • Collecting the vegetal residue after harvesting
  • Chemical treatments, using Dithane M45, Topsin, Merpan 50 WP, Captan 80 WDG, Melody Compact 49 WG;

White mold caused by Sclerotinia sclerotiorum

Irregularly shaped spots appear on the stems, which grow towards the branches and leaves. The pea pods have soft and moist injuries, which unite and lead to destroying the pea pods. As the disease evolves, on those spots a white fluff will grow and this represents the growth of the fungus.

peas pisum sativum white mold

Prevention and control measures:

  • Correct crop rotation
  • Collecting and destroying the vegetal residue after harvesting
  • Taking out the affected plants from the crop
  • Avoiding sprinkler irrigation
  • Balanced fertilization
  • Disinfecting the seeds. For more information related to methods of disinfecting the seed, click here;
  • Chemical treatments, using Topsin, Ortiva 250 SC, Switch 625 WG, Rovral 500 SC, Orius 25 EW;

Gray mold disease caused by Botrytis cinerea

The leaves’ veins start growing yellow, circular spots, which turn brown after some time. On the pea pods, the attack is visible in the form of a moist mold. This is first visible on the tip of the pea pods. The attack on the stems is visible thanks to some moist spots which appear. The plant wilts above the affected area.

peas pisum sativum gray mold

Prevention and control measures:

  • Taking out the affected plants from the crop
  • Avoiding sprinkler irrigation
  • Balanced fertilization
  • Disinfecting the seeds. For more information related to methods of disinfecting the seed, click here
  • Chemical treatments during the vegetative period, using Rovral 500 SC, Folpan 80 WDG, Teldor 500 SC, Switch 62.5 WG;

 

 

Fusarium wilt of peas caused by Fusarium oxysporum

The first visible symptoms are wilting grown leaves. As the disease evolves, the entire plant wilts. The stems can have several spots where a white, gooey substance appears; this represents the fungus growth.

peas pisum sativum fusarium wilt

Prevention and control measures:

  • Correct crop rotation
  • Disinfecting the seeds. For more information related to methods of disinfecting the seed, click here;
  • Chemical treatments using Topsin 500 SC, Topsin 70 WDG. Mix 5 grams or 10 grams of the product with 10 liters of water and spray each plant with about half a liter of that mixture.

Main pests

The pea thrips (Kakothrips robustus)

These are small insects, barely visible, which attack a large number of cultivated plants. They colonize flowers and leaves, determining plant abortion and preventing the plants from growing.

peas pisum sativum thrips

Prevention:

  • Treatments using Actara 25 WG, Mavrik 2 F, Karate Zeon 50 CS, Decis Mega 50 EW;
  • Using sticky traps

Aphids

Are a polyphagous specie that migrates from one plant to another or from one specie to another. These grow on spontaneous plants and then migrate to crops. They can be seen as colonies on the back of the leaves, on the flowers or on the small blooms from the sprouts. They sting the plant and drink the juice that flows through a plant’s vascular system, causing stress to the plant. They can also kill the plant in case of a severe attack.peas pisum sativum aphids

Prevention:

  • Treating areas with Decis Mega 50 EC (0.2 l/ha), Confidor Energy (0.6 l/ha), Mospilan 20 SG (1.5 gr/ 12 l water), Actara 25 WG;
  • Using sticky traps

 

Pea weevil (Bruchus pisorum)

They grow one generation per year and spend the winter as an adult in warehouses, infested seeds, cracks on the walls or floors. Some part of the adults spend the winter in the field, in infested seeds, which were shaken when harvesting, or in the cracks of the tree barks or under the vegetal residue. This is a monophagous specie, the larvae eat the inside of the pea, consuming up to 40-50% of its mass.

peas pisum sativum weevil

Prevention:

  • Chemical treatments during the vegetative period, using Decis Mega EW 50, Mavrik 2 F, Fastac Active, Reldan 22 EC or treating the warehouses with K-Obiol.

 

 

 

Pea moth (Laspeyresia dorsana)

They grow one generation per year and they spend the winter as a fully grown lava in a silky cocoon in the soil. It attacks peas, but it can attack other species of leguminous plants. The larvae chew the peas unevenly. A larvae can attack up to 4 peas. Inside the peapods one can observe silky pods and the larvae fecal matter, which reduce the quality of the harvest.

peas pisum sativum moth

Prevention:

  • Chemical treatments, using Fury 10 EC, Laser 240 SC, Kaiso Sorbie 5 WG, Decis Meg EW 50.

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