- Bush cultivar of french bean requires an amount of 40kg/ha of nitrogen, 90kg/ha of phosphorus and 90kg/ha of potassium as nutrient treatment.
- It is highly effective to apply half of N along with full P and K, as basal dose while making the furrows and ridges for sowing the seeds and also after a week from germination.
- Micronutrients are also very important for high productivity of french bean, hence 0.1% of B, Cu, Mo, Zn, Mn and Mg is recommended for improving the quality and pod formation.
- Apply 20 – 25 tons of FYM per ha for better nutrient management.
- Excessive application of nitrogen should be avoided as it may lead to vigorous vegetative growth at expense of pod formation.
After sowing the seeds, weeds start to grow after 2 or 3 weeks. Initially, before sowing the field can be tilled and ploughed to remove all the weeds. After the seeds germination, the field requires weeding manually and hoeing at interval of 15 days twice to eliminate the potential threat by weeds. Weed can be controlled by application of 2 to 2.5 kg/ha Alachlor. Many weedicides like Stomp at 3L/ha or Goal at 750ml/ha can be sprayed for effective control of weeds for about 45 days. Another chemical Basagran can also be used to control broad leaved weeds.
Pests and Management
Corn Earworm (Helicoverpa zea)
The larvae damage the leaves, buds, flowers and pods. The larvae damages the flowers and bore into fruit. Large entry holes are very evident which may lead to internal rotting. It can be controlled by spraying insecticides and also the insects can be removed by shaking the plant on white sheet.
Aphids (Aphid craccivora)
Mainly cowpea and pea aphids infest french bean. If aphid infestation is heavy, it causes leaves to turn yellow and necrotic spots appear on the leaves and shoots appear to be stunted. It also causes retardation in the growth of vines adversely affecting the yield. It can be managed by covering the plant with reflective mulches like silver coloured plastic and also by spraying the plant with strong water jet. One of the best way to control is use of insecticidal soaps or oil like neem or canola oil. It can also be controlled by spraying Methyl Demeton 25 EC or Dimethoate 30 EC each at 1ml/lit. It can also be controlled by spraying 1ml/L of water of Rogar or Metasystox. Spraying insecticides like Thiodan at 1ml/L or Sevin at 2ml/L is also highly effective.