(“sota” in Swahili) are 2 to 4 cm long, c-shaped larvae. They are pencil-thick,
soft and dark brownish-grey, like the soil. The older, bigger larvae can cut and chew young tomato stems quickly. Under a freshly cut seedling, you can often find a cutworm larva under the soil surface.
Cutworm larvae live in and on the
soil surface. During the night and early mornings they search for stems of
tomato seedlings, particularly after transplanting. They eat the stems at
ground level and cut them. Serious
problems occur in the dry season. Chemical control of larvae is possible, but
often it is too late to prevent the cutting. Later, cutworms become moths.
If you have experienced cutworm damage the previous
season, then preventive measures must be taken:
plough before and after cropping to expose cutworms to natural enemies
day after transplanting, push protective collars made of plastic bottles into
soil around seedlings to protect them from cutworms
insert two dry wooden sticks next to the seedling stems. Sticks should be the same thickness as an
adult finger and about a hand to two hands long. The sticks will confuse the arriving
During mass outbreaks (uncountable numbers of larvae)
more action might be taken:
pick larvae from the soil at night or early in the morning
ash around the seedlings
30-40 hot peppers or 1/2 litre of hot pepper powder into a 10 litre big bucket
of warm (not boiling) water. Let the liquid steep (infuse) for 1 day. Remove
the pepper and dilute with another 10 litres of cold water in the knapsack
sprayer. Add 20 drops of dishwashing soap. Spray in the evening directly on to
the soil around the stem of seedlings or young plants until soil is wet.
possible, avoid spraying pesticides because the ones used for cutworm larvae
(e.g. carbaryl, bifenthrin, WHO toxicity class II moderately hazardous) are
toxic. If pesticides must be used, spray in the evening directly on to the soil
around stems of seedlings and young plantings. Apply 1 spray per early season
only, and do not enter field for 1 day because sprays are toxic. Do not spray
14 days or less before harvest.
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.