Manganese Deficiency in Cucurbits

  • Symptoms

  • Trigger

  • Biological Control

  • Chemical Control

  • Preventive Measures

Manganese Deficiency in Cucurbits

Manganese Deficiency

Deficiency


In a Nutshell

  • Mottled, diffuse, pale green to yellow interveinal chlorosis on both young and mature leaves.
  • Small necrotic lesions develop on the chlorotic areas.

Hosts

Cucumber

Melon

Pumpkin

Zucchini

Symptoms

Symptoms are less dramatic than other nutrient deficiencies. The veins of middle and upper leaves of manganese-deficient plants remain green while the rest of the leaf blade becomes mottled with pale green to yellow areas. Later, small necrotic lesions develop on the chlorotic tissues, particularly near the margins and tip (tip burn). Reduced leave size, deformation and crimping of leaf margins are other possible symptoms.

Trigger

Highly acidic soils increase the availability of this nutrient. By contrast, alkaline soils can lead to manganese deficiencies. Excessive or unbalanced use of fertilizers may also result in some micronutrients competing with each other to become available to the plant. As iron, copper and zinc, manganese is used as enzyme catalyst in the plant cells. It is needed for plant basic metabolic reactions such as photosynthesis, respiration, nitrate assimilation and the production of the plant hormone auxin. Like iron, boron and calcium, manganese is immobile within the plant, accumulating mostly in the lower leaves. This explains why the symptoms develop first on mature leaves. Visual diagnosis is a simple tool, but it has some limitations. Soil and foliar analysis can be helpful to complement and confirm visual symptoms.

Biological Control

Use manure, organic mulches or compost to balance the nutrient content in the soil. These contain organic matter and many nutrients.

Chemical Control

Use a balanced fertilizer program appropriate to the soil and to the crop in question. Plants absorb manganese as an ion through their foliage as well as their roots. That means that either foliage sprays or soil applications can be used. The most common fertilizer is manganese sulfate. Manganese application is often required with zinc application. Take care of the specified amounts and right utilization.

Preventive Measures

Check the pH of the soil and lime if necessary to get the optimal range.,Plan a good drainage of fields and do not over water the crop.,Use organic mulch to keep soil moisture stable.,Always keep in mind that only a balanced fertilization can lead to optimal plant health and increased yield.