I. Characteristics of several pests
1. Pear insects. Adults lurked in the soil at a depth of 6 cm. They were unearthed from April to mid-May. They began mating one week later and spawned. At this time, the pears were about the size of the thumb. At the time of spawning, the base of the stalk was bitten, and then transferred to the fruit to bite a small hole, and 1 to 2 eggs were produced. After the ovum was secreted, a round brown dot was slightly raised and the fruit was shrunk after 10 days. , and gradually fall to the ground.
2. Pear real bees. The mature larvae in the soil 3 to 10 cm deep in the winter. When the pears began to bloom, the adults began to unearth, and the most unearthed were during the flowering period. The eggs are produced in the calyx tissue, and the damaged calyx is black. Larvae have turned fruit as a hazard. 1 larvae turned fruit and killed 5 fruits. It can also damage the base of the stem, hollowing out the base of the stem, and withering off. The larvae have a duration of 15 days to 20 days.
3. Pear roll leafhoppers. The larvae winter in the soil about 2 cm deep. In the middle of March of the following year, when the leaves of the pears grow, the adults emerge, and the eggs are laid on the edges of young shoots. After the larvae have hatched, the leaves are scraped and sucked so that the wounded parts of the leaves become cylindrical and the tube is hard and inflated. Larvae hidden in it. The injured leaves can easily attract pear wood rakes.
Second, prevention and control technology
1. Strengthen agricultural control and reduce the source of insects. During the winter, the ploughs that fell on the ground were turned into the ground, and the overwintering pests on the ground turned to the ground, destroying the dormant environment of pests. According to field surveys, compared with plowed or uncultivated pear orchards, the damage rate of P. elegans to young fruits was 9.3%, and P. striata mosquitoes were 7.8% to the shoots. 2) Weeding in early spring to maintain the cleanliness and destruction of pears. Insects inhabit the environment, 3 in the pear orchard that is not serious, artificial insects can be removed.
2. Focus on the ground to spread medicine. The overwintering adult was at the beginning of the excavation period. Pyralidae was from mid-March to the end of March. The Pear was from the end of March to the beginning of April, and the Pest-like beetles were in April and mid-April. Spread the pesticide at the beginning of the excavation. Mu with 5% trichlorfon dressing agent 4 kg, mixed with fine soil or fine sand in the canopy drip line between the lines, the effect is good. After light rain or showers, the effect will be more pronounced.
3. Suitable canopy spray. In the period of pear infestation, P. citriformis and P. edulis emerged during the peak period, drug control can play the role of pre-press control. Pest control insects can use 90% of crystal trichlorfon 700 times or enemy kill 2.5% of EC 1500 times, the control of pears can be used to eliminate swage 20% EC 2000 times or 40% omethoate 1200 times : It is possible to use 25% of insecticidal double 500 times for controlling Pesticides.
1. Pear insects. Adults lurked in the soil at a depth of 6 cm. They were unearthed from April to mid-May. They began mating one week later and spawned. At this time, the pears were about the size of the thumb. At the time of spawning, the base of the stalk was bitten, and then transferred to the fruit to bite a small hole, and 1 to 2 eggs were produced. After the ovum was secreted, a round brown dot was slightly raised and the fruit was shrunk after 10 days. , and gradually fall to the ground.
2. Pear real bees. The mature larvae in the soil 3 to 10 cm deep in the winter. When the pears began to bloom, the adults began to unearth, and the most unearthed were during the flowering period. The eggs are produced in the calyx tissue, and the damaged calyx is black. Larvae have turned fruit as a hazard. 1 larvae turned fruit and killed 5 fruits. It can also damage the base of the stem, hollowing out the base of the stem, and withering off. The larvae have a duration of 15 days to 20 days.
3. Pear roll leafhoppers. The larvae winter in the soil about 2 cm deep. In the middle of March of the following year, when the leaves of the pears grow, the adults emerge, and the eggs are laid on the edges of young shoots. After the larvae have hatched, the leaves are scraped and sucked so that the wounded parts of the leaves become cylindrical and the tube is hard and inflated. Larvae hidden in it. The injured leaves can easily attract pear wood rakes.
Second, prevention and control technology
1. Strengthen agricultural control and reduce the source of insects. During the winter, the ploughs that fell on the ground were turned into the ground, and the overwintering pests on the ground turned to the ground, destroying the dormant environment of pests. According to field surveys, compared with plowed or uncultivated pear orchards, the damage rate of P. elegans to young fruits was 9.3%, and P. striata mosquitoes were 7.8% to the shoots. 2) Weeding in early spring to maintain the cleanliness and destruction of pears. Insects inhabit the environment, 3 in the pear orchard that is not serious, artificial insects can be removed.
2. Focus on the ground to spread medicine. The overwintering adult was at the beginning of the excavation period. Pyralidae was from mid-March to the end of March. The Pear was from the end of March to the beginning of April, and the Pest-like beetles were in April and mid-April. Spread the pesticide at the beginning of the excavation. Mu with 5% trichlorfon dressing agent 4 kg, mixed with fine soil or fine sand in the canopy drip line between the lines, the effect is good. After light rain or showers, the effect will be more pronounced.
3. Suitable canopy spray. In the period of pear infestation, P. citriformis and P. edulis emerged during the peak period, drug control can play the role of pre-press control. Pest control insects can use 90% of crystal trichlorfon 700 times or enemy kill 2.5% of EC 1500 times, the control of pears can be used to eliminate swage 20% EC 2000 times or 40% omethoate 1200 times : It is possible to use 25% of insecticidal double 500 times for controlling Pesticides.
ZHEJIANG SHENDASIAO MEDICAL INSTRUMENT CO.,LTD. , https://www.shendasiaomed.com