compete with maize for light, space, water and nutrients, particularly when the
maize is young. Maize plants remain small and weak. If weeds are not
controlled on time, maize yield can be low.
A weed is
a plant that grows at a place where it has negative effects on a crop. Most
weeds can be controlled mechanically by pulling out, harrowing, or tillage. Some
serious weeds are chemically controlled. Be careful, some chemicals can only
be sprayed before maize germinates, few can also be sprayed later.
Glyphosate is a non-selective herbicide.
This means it kills any plant, also maize. Trade names are Cycat, Round up, Muscle
up, Springbok, Scat, Erase, and others. It slightly toxic to you (WHO toxicity
before sowing or after sowing but before maize germinates ! Otherwise
you kill the maize. Use an orange fan-jet nozzle or another fine flat spray
nozzle to reach all leaves of weeds.
700 ml or 500gm in a 16-litre sprayer. This translates to 4 litres product /
hectare. But double-check labels as the products differ.
spraying, the soil may be dry or moist but leaves should be young and fresh but
not wet. Spray at dry weather or at least 4 hours before rain. Do not enter the
field after spray for ½ day.
Topramezone - Dicamba mixes are selective
herbicides and sprayed when weeds and maize have emerged. It is most effective
when weeds are at 3 to 4 leaf stage. It controls some annual grasses; but
mainly broad leaf weeds. It can suppress Kapinga. Product names are Stellar
Star, and others. It takes some days to kill the weeds. It is of WHO toxicity class II, thus moderately
toxic to you.
a blue fan-jet nozzle which has a bigger hole.
It requires a higher water dilution rate as compared to glyphosate.
80ml in a 16-litre sprayer. The usual rate is 1 litre product / hectare. But
double-check label for details as the products differ.
spraying, weeds should be fresh but not wet. Hold the nozzle 1/2m high from the
ground along planting lines walking 50 meters in 45 seconds.
spraying, do not enter the field for at least ½ a day.
- high from the ground along planting lines
walking 50 meters in 45 seconds. After spraying, do not enter the field for at
least ½ a day.dry or wet. When spraying hold the nozzle 1/2m high from the
ground along planting lines walking 50 meters in 45 seconds. Do not enter after
spray for ½ a day at least.
When using a pesticide, always wear protective clothing and follow the instructions on the product label, such as dosage, timing of application, and pre-harvest interval.