Aphids are one of the most common problems for tomato plants. They grow fast and form colonies on tender leaves. They also pose a threat by having the ability to transmit viruses. The main difficulty here is their resistance to many insecticides.
Symptoms
The adult aphids as well as the nymphs suck the sap of younger plants and their succulent parts. The affected plants show twisted or curled leaves and swollen branches. When left untreated, they may even lead to uncontrolled infestation causing stunted growth of the plant. The affected leaves may turn yellow or brown. They secrete sugary substance called ‘honeydew‘ which attracts ants and promotes sooty mould growth.
Preventive Measures
- Planting companion crops and trap crops are one of the most effective ways to control these aphids.
- Release natural predators such as ladybugs and green lacewings to control the aphid population.
- Installing sticky traps in the field and maintaining the field weed-free are other popular methods to prevent aphid infestation.
Chemical Control
- Shamrock Overseas Limited Prime Gold Insecticide: It is a systemic insecticide containing Acetamiprid 20% SP and is effective against a wide spectrum of insects. It comes as a soluble powder which is diluted in water and sprayed on the crops. The dilution is 20-40 gm per acre.
- Marshal Insecticide: It is a contact insecticide which can also be a stomach poison for aphids. The active ingredient Carbosulfan 25% EC fights off chewing and sucking pests from the crops and promotes healthy growth of the plants. The recommended dosage for this liquid insecticide is 320-400 ml per acre.
- Tatafen Insecticide: The 10% EC of Fenvalerate in this insecticide is effective against sucking pests via contact synthetic pyrethroid action. It works on a wide range of pests and is highly effective. The recommended dosage for this is 2.5 ml/liter or 500 ml per acre.
Conclusion
The damage caused by aphids on tomato plants is multilevel from affecting the leaves thus preventing proper photosynthesis to infesting fruits making them unfit for markets. Proper management of these pests with these insecticides along with proper prevention measures are essential. Only the combined efforts can be fruitful as they could be resistant to many insecticides.
Note: The information contained herein is for informational purposes only. Nothing herein shall be construed to be financial or legal advice. Pesticides are a considerable risk of loss in crops and viewers are advised to do their own research before making any decisions.
