Tea tree leaf roller

The scientific name of Adoxophyes orana Fischer von Roslerstamm is Lepidoptera, Tortricidae. Alias ​​small yellow leaf roller moth, cotton roll moth, cotton brown leaf roller moth. The distribution has not been reported in Tibet, but it has been widely distributed throughout the country. The Yellow River and the Yangtze River have a high density throughout the year.

Host plants such as tea, oil tea, citrus, pear, plum, apple, peach, mulberry, cotton, etc.

The characteristics of the larvae entangle the young leaves, and lurk them to feed on them, resulting in the reduction of fresh leaves, and the growth of buds is inhibited. After the damaged tea shoots are made into tea leaves, there are many fragments and the quality is reduced. Severe tea pods are reddish-brown.

Morphological characteristics can be seen in the cotton pests of cotton brown moths.

Life habits Anhui, Jiangsu, Zhejiang 4-5 generations old, Jiangxi 5 generations, Hunan 5-6 generations, Guangdong 6-7 generations, with 3-5 larvae wintering, some areas in order to cricket winter. In the southern tea region of Anhui, overwintering larvae began to incur in temperatures of 7-10°C in the middle and late March of the following year, and in the middle and mid-April of April, the larvae were eliminated. 1 - 5th generation larvae damage period: 1 generation from late April to late May; 2 generations from mid-to-late June; 3 generations from mid-July to early August; 4 generations from mid-August to early September; From early to late April. In addition to a relatively neat generation, there will be overlapping generations in different generations. The second generation was the most serious. Adults inhabit the tea in the daytime. They come out during the night and they cooize in the early evening or early morning. The eggs are produced on the back of the old leaves in the early morning. The first and second generations are prolific in the middle and lower leaves. The three generations are prolific in the middle and upper parts. Each female lays eggs. - 4 blocks, 60 to 80 tablets each. The newly hatched larvae climbed to the top of the tea tree buds and shoots. The majority of the larvae inhabited the bud tip joints, and some of them were coiled on the tips of the young leaves and the leaves were eaten. The number of larvae on the first leaf under the bud is large. After 3rd instar larvae, the leaves of several nearby larvae are often tied into a pupa. The larvae are hidden in the pupa. The larvae collect in the pupa and form a transparent and dead spot. The amount of aftergrowth increases, and the buds often transfer and continue to grow. For damage, each larva can damage 1-2 buds or 3-7 leaves. After the larvae grow up, they transfer from the upper part to the lower old part of the larvae. The larvae are lively, startling rapidly backwards after the third instar, or the larvae droop or transfer to the ground. An average temperature of 18-26 degrees Celsius, relative humidity of more than 80% of its occurrence. The natural enemies are Trichogramma, T. urticae, T. edulis, and T. vulgaris.

Prevention methods (1) Strengthen the tea garden management, scientific pruning, timely cultivating and weeding, making the tea garden airy and transparent, can reduce the occurrence of tea leaf roller moth. (2) When picking tea in the spring, pay attention to pinch the newly hatched larvae and the large larvae of the larvae. (3) Adult insects are set to trap insects or sweet and sour liquid to trap adult insects. (4) In the 1st and 2nd instar larvae at the peak of hair growth stage, 90% crystals of trichlorfon or 80% of dichlorvos, 50% of malathion, 25% of imine sulfur were sprayed timely when there were 3.6 insects per worm. Phosphorus Emulsifiable Concentrate, 50% Acacia Pine Emulsion, 75% Acephamidem Emulsion, 90% Bataan WP etc 900 to 1000 times. In addition, it is also possible to use 50% phoxim emulsion 1400 times or 10% Uranus EC 5000 times and 2.5% rattan 300-400 times. (5) 0.5 to 1 kg of Beauveria bassiana powder per g containing 10 billion spores is effective in preventing and controlling l-2 instar larvae under wet conditions. (6) 80,000 to 120,000 Trichogramma per 667m2 were released during the egg period, and the parasitism rate was 70% to 80%. In addition, the use of pheromone traps is also available, and it is also possible to spray the C. oleifera granulosis virus for biological control. Practice: Aocv field dosage is 20mg per km2, equivalent to the content of 25 cadaver carcasses, water 125kg, spraying in the first generation or second generation larvae hatching, contemporary larvae incidence of 95%, can Last 8-9 years.

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