Gabriele Stoll
Natural Crop Protection in the Tropics
Letting Information Come to Life
Methods of Field Protection
Insects
Insect-controlling plants
Overview: Further plants with
insect-controlling properties
Andrographis
Andrographis paniculata, Fam. Acanthaceae
Plant parts
Mode of action
Target organisms
Preparation & application
Whole plant
Repellent
Aphids, thrips, whiteflies
2 kg of fresh plant material are mixed
with 250 ml of water with the help of a grinder or similar
device. This yields about
1 litre of plant liquid. Then 1 litre of
cow's urine is added and 10 g of well-crushed dried chilli
fruits. To this, 10 litres of water are stirred in. This
solution is allowed to stand for some time. Then it is filtered
and ready to spray. In bitter gourd cultivation, this extract
is applied at the fruiting stage, when the incidence of Diaphania indica is
critical. Application is repeated depending on the need.
Apazote
Chenopodium ambrosioides, Fa. Asteraceae
Plant parts
Mode of action
Target organisms
Preparation & application
Leaves
Repellent
General
1–6 kg of leaves are ground up and
soaked in water for 24 hours. After filtering the solution is
filled up to 20 litres.
Artemisia
Artemisia vulgaris, Fam. Asteraceae
Plant parts
Mode of action
Target organisms
Preparation & application
Whole plant
Insecticidal
Holotrichia spp.,
cockchafer, greenfly
a) The plant material is mixed with the
water at a rate of 1:4 and left to stand for 2–7 days.
The strength of the extract depends on the severity of pest
attack.
b) Loopings of Artemisia vulgaris placed
along with mulch discourage the laying of cockchafer eggs.
Bitter tree
Celastus angulatus, Fam. Celastraceae
Plant parts
Mode of action
Target organisms
Preparation & application
Seed oil , root bark
Repellent, insecticidal
Pieris rapae,
cucumber beetle, common cutworm
A spray of 1.5% seed oil gives good
protection.
The printed version contains more
information about the following plants:
Bitter yam
Black Jack
Buddleia
Calotropis
Castorbean
Coriander
Cube
Desert lavender
Endod
Eupatorium
Finger euphorbia
Fish berry
Golden shower
Guinea hen weed
Lansones
Leech lime
Lemongrass
Oleander
Onion
Pepper tree
Periwinkle
Physic nut
Puerco
Purging croton
Stemona
Thundergod vine
Toona
Tomato
Wild sunflower
Wormwood
Yam bean