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Noxious weeds

Noxious weeds

What is Noxious Weeds?

Noxious weeds are weeds that is harmful to Horticulture-Agriculture crops, live stocks, environment etc, which leads to lethal effects on the Agriculture economy of the country at all. Such weeds are very difficult to control, however certain chemicals are very effective to control these weeds.

List of the Major Noxious Weeds as under:

  1. Cynodon dactylon-Dharo
  2. Cyperus rotundus-Nut Grass
  3. Convolvulus arvensis-Field Bind Weeds
  4. Parthenium hysterophorus –Gajar Grass
  5. Sorghum halepense –Johnson Grass
  6. Typha angustifolia-Narrow Leaf Cattail
  7. Phalaris minor- Gullidanda
  8. Eichhornia crassipes-Water hyacinth
  9. Cuscuta reflexa- Amarvel
  10. Striga asiatica-Agiyo
  11. Lantana camara- Lantana

In agriculture, we have four main enemies: DISEASE, PESTS, RODENTS AND WEEDS. Out of this, 26.3 percent by disease, 9.6 percent by pests, 13.8 percent by mice and THE HIGHEST 33.8 PERCENT BY WEEDS have been recorded in crop production. Weeds can cause 10 to 100 percent yield loss in different crops. A Noxious weeds growing alongside other crops, reducing crop yield and quality, increasing the cost of cultivation, persisting even in adverse climate is the biggest and hidden enemy of farmers.

Thus, most perennial weeds are not particularly difficult to control. The weeds which cannot be controlled by any means are called noxious weeds. Such weeds with a life span of more than two years are also called perennial weeds.

Noxious weeds

(1)Cynodon dactylon

Control:

Noxious weeds

(2)Cyperus rotundus

  Control:

Noxious weeds

(3)Convolvulus arvensis:

Control:

Noxious weeds

(4)Parthenium hysterophorus:

Control:

Noxious weeds

(5)Sorghum halepense:

Control:

Noxious weeds

(6)Typha angustifolia:

Control:

Noxious weeds

(7)Gullidanda (Phalaris minor):

Control:

Noxious weeds

(8)Eichhornia crassipes:

Control:

Noxious weeds

(9)Amarvel (Cuscuta reflexa):

Control:

Noxious weeds

(10)Striga asiatica:

Control:

Noxious weeds

(11)Lantana (Lantana camara):

Control:

Benefits of Lantana camera  

Summary:

Noxious weeds are harmful to agriculture, crops, live stocks, and the environment, causing lethal effects on the country’s agriculture economy. Major noxious weeds include Cynodon dactylon (Dharo), Cyperus rotundus (Nut Grass), and Convolvulus arvensis (Field Bind Weeds). These weeds can cause yield loss in different crops and can be controlled using herbicides like Dalapon, TCA, Diuron, Glyphosate, Amitrol-T, and Uracil.

Cynodon dactylon is a perennial, shallow-rooted, monocotyledonous weed that occurs in all places, seasons, and crops. Its growth is mainly in hot and humid conditions and prefers black, loamy, fertile, and moist soil. Cyperus rotundus is a perennial, deep-rooted monocot weed that occurs everywhere, in all seasons, and in all crops. Control measures include hand-pulling, spraying 2,4-D, diquat, glyphosate, metribuzin, metsulfuron, and chlorimuron.

Convolvulus arvensis is a perennial, deep-rooted, creeping dicotyledonous weed that occurs in cultivated, orchard, and non-cultivated areas in semi-arid areas. Control measures include deep plowing, collecting and destroying roots, cultivating every 15-20 days in fallow land, and rotating fodder crops.

Carrot grass is a dicotyledonous weed that is insensitive to rainfall, light, and temperature, producing 5,000 to 10,000 seeds per plant. Control measures include hand-pulling, spraying 2,4-D, diquat, glyphosate, metribuzin, metsulfuron, and chlorimuron.

Sorghum halepense is a perennial grass that can grow up to 2 meters tall and produces abundant seeds in winter. Control measures include deep plowing, applying two sprays of Dalapone, sowing cotton, maize, and soybeans, and spraying Dalapon, Diuron, Bromacil, sodium chlorate, glyphosate, and paraquat before flowering.

Eichhornia crassipes is an aquatic weed with 10-20 cm broad leaves that float in water. Control methods include pulling plants from water or canals, drying and burning them, and placing a net at the canal entrance. Control methods include sowing weed-free seeds, irrigating and ploughing the land, crop rotation using monocots, and planting sunflower, guar, or jute crops.

Striga asiatica is a rainfed and partly parasitic weed that emerges from the soil after 20 days and produces millions of seeds. Control methods include uprooting and destroying Striga asiatica before flowering, spraying 2,4-D (Ester) 1.0 kg/ha, and giving granular atrazine 0.5-1.0 kg/ha before weed emergence. Lantana camera is a perennial, invasive, non-native imported weed with multi-colored flowers imported from Sri Lanka as an ornamental fence.

Noxious weeds

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