Best Viewed in Mozilla Firefox, Google Chrome

24
Jun

Herbicide Resistance and Genetically Modified Crops

1. Continued use of a single herbicide will result in a shift of weed species to those that are tolerant or resistant to the herbicide or to individuals within the same species that become resistant to the herbicides. In Korea, annual weeds such as Echinochloa crusgalli and Monochoria vaginalis, and perennials such as Sagittaria trifolia, Sagittaria pygmaea, Eleocharis kuroguwai, Cyperus serotinus and Potamogeton distinctus, have been the most important weed species in paddy fields. 2. Now,
24
Jun

Methods of Herbicide Application

 Herbicide applicators are for distributing an exact quantity of herbicide uniformly over an area.

i) Pressurized applicators – Hydraulic applicators (Knapsack sprayer)

ii) Non-pressurized applicators – Granular applicator, Water gun, Direct contact applicator, Controlled–droplet applicators.

 

24
Jun

Time of application of herbicides

 

1. Pre-plant applications are sprayed on the foliage of existing vegetation prior to planting or they are made to the soil and may be incorporated in areas where rainfall is unpredictable or if the herbicide is volatile or is subject to rapid photo-decomposition.

2. Post plant applications may be made  to the soil surface following planting and prior to emergence of either crop or weeds (pre-emergence) or  to the weed and crop seedling whether in contact with the

24
Jun

How to avoid spray drift

 1. Spray in morning or evening hours when gentle wind is there and away from sensitive crops

2.  Use only minimum pressure required for nozzles to operate

3.  Use large nozzle tips for larger spray volumes, larger size droplets

4.  Hold the sprayer nozzles close to the target

5. Leaving a 10 metre wide strip of rice crop unsprayed where neighbouring crops are sensitive.

6.  Non chemical methods of weed control  can be followed in th

24
Jun

Herbicide drift

 

 1. Herbicide drift occurs when the smaller drops in the spray are carried away from the target area by wind or when vapour from a volatile herbicide is carried away during or after spraying. 

e.g: 2,4-D (growth regulator herbicide) causes greatest drift damage to sensitive crops like tomato, lettuce, cotton, fruit trees.

 

Copy rights | Disclaimer | RKMP Policies