A netizen said that the tomato planted last year, Bai Lai, do not know what reason the leaves are eaten by the dragon and lack of carving? What technical measures should be taken to reduce production and income in order to obtain high yields and good quality?
Netizen: Hello! According to the symptoms described, it is caused by bollworm harm.
I. Field symptoms:
Cotton bollworms are called cotton nocturnal moths in some places. The larvae bite the tomato, the new leaves of the young shoots, the buds, and the fruit, causing the leaves to be missing and falling fruit.
Young fruits are often eaten or rotted and fallen, and the fruits will be eaten partially, but due to the decay of the Conti, rainwater flows in, causing rotten fruits to fall. Resulting in severe production cuts.
Second, the morphological characteristics:
Adults are 13 to 18 cm long and have a wingspan of about 35 to 38 cm. It is yellowish brown in color. The outer transverse line has a dark gray, kidney stripe.
The mature larvae are 30 to 40 cm long, and the body color changes greatly, with light green, green, and reddish, and the body wall is thicker.
Third, the incidence of the law and life habits:
1) The first generation was harmed in tomatoes.
Adults inhabit the underside of leaves or in shade during the day and begin to move at dusk, flying vigorously and phototropism.
2) Temperature between 25 degrees and 28 degrees Celsius and humidity of 70% to 85% are the most suitable conditions for the occurrence of cotton bollworms.
The second generation, the third generation is the most harmful. In late October, 5-15 cm pupae are overwintered.
Fourth, prevention and control technology:
1. In winter, 100 jin of lime nitrogen is sprinkled on the mu, the deep plough is more than 25 cm, and the water is irrigated twice after ploughing. Works well.
The benefits of this are:
Kill insects quickly and kill insects accurately. It is conducive to tomato growth, fruitful, large results, high yield, good quality and high efficiency.
2. At the beginning of tomato fruiting:
Spray 2.5% high efficiency cypermethrin emulsion 2000 times liquid + 5 grams of thiamethoxen + 100 kg of water mixed evenly, in the evening without wind, spray on the back of the leaf or shade, once every 10 days, 2 times in a row. Works best.
Completely eradicating the harm of cotton bollworm is conducive to tomato fruit, no insect pests, good quality, more than 60% per mu, and better benefits.
3. When the tomato grows to the size of an egg:
Mu spray cotton bollworm karyotype polyhedral virus 22 g + 5% methylamino avidin emulsion 4 100 liters + water 100 kg, in the evening without wind, sprayed on the back of the leaf or shade, the most ideal medication.
Cure insects fast, clean, very beneficial to tomato results, more conducive, good quality, mu can increase yield by more than 60%, higher efficiency.
4. At the peak of spawning of cotton bollworms:
Mu Shi cotton bollworm nuclear polyhedral virus 22 g + 2.5% cypermethrin emulsion 2000 times liquid + water 100 kg, the best use of medicine in the cloudy days without wind.
Cure the worm thoroughly and cleanly, so that the tomato bears more, bears large, does not rot fruit, and does not fall.
Rotten tomatoes, dropped seriously affect yield, quality and economic benefits.
In the work of preventing and controlling cotton bollworms, we must be early, accurate, fierce, and fierce. Only in this way can we achieve the yearning for doubling tomato yield and win-win benefits.
Tomatoes are one of the common vegetables on our table, grow well, eat well, and grow healthy for everyone's common wish.
Thank you netizens click to pay attention, click to read, interactive review ah!
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