"I love that you've brought this to attention. An extensive database of uncommon but resistant and hardy plants/foods could be developed and organized by climate. Ease of growth and processing should also be taken in to account. I will try to…"
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Preparation of some safer insecticidal materials for common use
Kerosene emulsion
This is a contact insecticide useful against many sucking insects. For preparing this, slice 500 g of ordinary bar soap and dissolve in 4.5 litres of water by boiling. Cool and add 9 litres of kerosene under violent agitation till the oil is fully emulsified. The stock solution may be diluted with 15-20 times of water before spraying.
Tobacco decoction
This is very effective for controlling aphids and other soft-bodied insects infesting vegetable crops. Tobacco decoction can be prepared by steeping 500 g of tobacco waste in 4.5 litres of water for 24 hours. Dissolve 120 g of ordinary bar soap separately in another vessel. The soap solution is added to tobacco decoction under violent agitation. Dilute this stock solution 6-7 times before spraying.
Neem seed kernel (NSK) extract
This is very effective as a repellent/deterrent against locusts, grasshoppers and other chewing insects particularly lepidopterans. The kernel should be ground into a coarse powder. Take 35 kg of NSK powder in a cloth bag, tie it and dip the cloth bag in 100 litres of water in a drum. Soak it for about 12 hours. Put some detergent (about 20 g) in the drum. Thereafter, squeeze the cloth bag repeatedly so that the out-flowing fluid turns light brownish. Dilute 1 (one) litre solution with 6 (six) litre of water (100 litre+600 litre=700 litre is final NSK extract which is sufficient for one hactare) and the NSK extract is now ready to be sprayed on crops.
Neem oil + garlic emulsion (2%)
To prepare 10 litres of 2% neem oil + garlic emulsion, 200 ml neem oil, 200 g garlic and 50 g ordinary bar soap are required. Slice the bar soap and dissolve in 500 ml lukewarm water. Grind 200 g of garlic and take the extract in 300 ml water. Pour the 500 ml soap solution in 200 ml neem oil slowly and stir vigorously to get a good emulsion. Mix the garlic extract in the neem oil + soap emulsion. Dilute this one litre stock solution by adding 9 litres of water to get 10 litres of 2% neem oil + garlic emulsion.
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