Activity damage characteristics
The vast majority of underground pests have the habit of feeding supplementary nutrients during the adult period, absorbing nutrients and energy for spawning. Food sources are mainly leaves, flowers or pollen. In addition to the ground pests, the soil temperature of general activities is between 15°C and 30°C. Therefore, each year, underground pests generally have two periods of activity: the mid-spring season and the mid-autumn season. Here's how to prevent underground tigers, cockroaches, golden needles, and beetles.
1, tiger
The ground tiger is also known as black soil silkworm and cutworm, and the adult period is from late March to early April. Young tigers of the ground tigers feed young shoots and young leaves of the seedlings and lurk in the soil near the roots during the third day of the day. Since climbing out of the soil, the seedlings are often snapped off from the roots and dragged into the soil to eat, causing seedlings to break.
Control methods:
1 Remove weeds. Weeds are the main sites for laying tigers and foods for young insects. In the early spring after the adult egg lays up, the larvae promptly clear the nursery and the surrounding weeds before they hatch and concentrate on erosion or burn.
2 trapping adult worms. Adults have phototaxis and prefer molasses. In the adult stage, blacklight trapping is used, or 6 parts of sugar, 3 parts of vinegar, 1 part of white wine, 10 parts of water are mixed with sweet and sour liquid, 1 part of powdered trichlorfon is added to 25%, and adult insects are trapped; fresh Paulownia leaves can be used. Trapping the ground tiger to kill it.
3 Control larvae. Use 25% of trichlorfon powder 500 grams, mixed with fine soil 2.5 to 3.0 kilograms, sprinkled in the seedlings and timely Shallow: or 80% of the dichlorvos EC 1:1000 to 1500 times watering.
4 Manual capture. The nursery was visited early in the morning and it was found that the planer caught the larvae when the seedlings were broken.
2. Scarab
Chafers are miscellaneous and widely distributed. Adult insects are called chafers. The leaf larvae that feed on various plants are called crickets and white-earth silkworms. Occupants in the soil endanger the roots of seedlings and are important pests in the roots of seedlings. From March to April, the soil temperature increased and began to move. The main part of the turfgrass and flowers were rooted in the roots and stems of the stalks, causing the seedlings to wither and die, and the clover to suffer more. From August to September, larvae take food around the roots of plants, affecting the growth of seedlings and causing serious seedling deaths.
Control methods:
1 Tillage seedlings, pick up adults and larvae and kill them, or drive chickens and ducks to feed. The applied compost and circling must be decomposed to prevent adults from laying eggs on them.
2 Adult phototaxis, black light trapping can be set; use of its suspended animation, artificially stricken by falling; adult pests are smoked using a smoke jet, or 2.5% of deltamethrin WP or pyrethroid , According to the conventional amount of spray control; with willow stick dip 30 to 50 times of monocrotophos or dimethoate 10 hours after the trap can kill.
3 larval control. Use 90% trichlorfon crystals and 80% dichlorvos EC 1:1000 to irrigate roots.
4 Use natural beetle predators such as various kinds of beneficial birds, frogs, and street bugs to kill.
3, è¼è›„
Also known as earthworms, the worm began to live in the early April and stayed up late. It gnawed seeds or bitten off the tender stems, which seriously affected the normal growth and development of the seedlings. Is a typical soil insects, adults and nymphs are used to sneak in the soil, digging into a crisscross tunnel, so that the seedling roots and soil separation, causing seedlings lose water and die. It has also eaten sown and germinated seeds, sometimes also snapping shoots of young seedlings, resulting in serious seedling failure.
Control methods:
1 Light trapping. The adult phototaxis is strong, light trapping is used during the eclosion period, and the effect of clear, windless and stifling nights is very good.
2 poison bait trapping. Use 15% of trichlorfon powder (25%) and 1O portion of bran or wheat bran to mix well. Evenly distribute the cloth on the seedbed at a dosage of 22.5 to 37.5 kg per hectare. Or dig a small pit (20cm x 40cm) every 20m or so in the nursery area and fill the pit with fresh horse dung or fresh grass mixed with wet soil. Place the poison bait on the trap.
3 poisonous soil treatment. In severely damaged nursery areas, 25% of trichlorfon powder 1 kg, fine soil 100 kg mixed and made into toxic soil, the amount per hectare is 195 to 255 kg, evenly spread on the seedbed and turned into the soil in time. Kill 3 days before sowing or transplanting seedlings.
4 Magpies and other insectivorous birds are the natural enemies of crickets. They can be found around the nursery to inhabit and reproduce by breeding the birds.
4, Goldworm
The golden worm is also known as a beetleworm. Adults do not harm the seedlings. The larvae mostly feed on the seedling roots, tubers, and seeds planted on the seedlings at night to cause seedlings to become seedlings. The seeds, germs, and rhizomes of green plants such as turfgrass are mainly eaten. The hazard is that the young roots are eaten into small holes, resulting in dead seedlings, lack of seedlings, or tuber rot. From mid-March to early April, the peak period of the unearthed activities of G. furfur was observed.
Control methods:
1 drug seed dressing. When sowing, 50% phoxim is used to add 5 to 7 liters of water per 100 ml.
2 Granules are administered. In the bed nursery, 5% phoxim granules were used, and 30-37.5 kg per hectare was applied to the topsoil for control.
3 Spread poisonous soil. It is the same as the method used to prevent warts.
4 Strengthen the nursery management, intensive cultivation, destruction of the suitable habitat of the C. sinensis or turning the C. sinensis out of the soil for birds to prey and reduce the population density.
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