The grubs Prevention - Photo identification technology

Damage characteristics

Very mixed diet of grubs, polyphagous pests, the harm crop seedlings, seeds and young roots, young stems. The grubs underground damage snapped seedling roots, neat incision, resulting seedlings withered, or eats into the roots, tubers, causing holes make crops grow weak, affecting the yield and quality. In the same time, the wounds caused by the grubs conducive to the invasion of bacteria, gives rise to other diseases. Adult chafers feeding on the leaves of the plant shoot, and some damage to flowers and fruits.Morphological characteristicsOf North China the black Melolonthidae (Holotrichiadiomphalia): adult oblong, black or dark brown, shiny; Coleoptera the scattered small engraved on point. Early egg production when oblong, milky white, smooth surface before hatching, spherical, transparent shell. Mature larva body bent nearly C-shaped, the body wall is softer, more wrinkles; hair on each side of the top of the head before the three was a tandem, two of which are close to the crown seam next; the anus hole 3 crack-like; anal abdominal films rear cover hair District the middle without bristles column only hook wool group. Pupae bare pupae, early white, and finally becomes yellowish-brown to red-brown.Diablo Melolonthidae (Holotrichiaparallela): adult early eclosion elytra milky, soft, after redden brown, after Coleoptera hardened into a dark brown or black, dull. Is early spawning milky, oblong, translucent. Mature larva head before the top of the hair on each side one, located crown sewn on both sides; the anal hole cracks like; anal belly piece rear cover hair District middle without bristles column, only hook and group, its top two single or double row hook and a "V" shaped arrangement, with bare area in the middle. Pupae from the pupa, the early pupation milky white after yellowing.Pseudomonas beetle (Anomalacarpulenta): adult slightly smaller head, pronotum, scutellum and Coleoptera aeruginous of metallic luster. The male ventral tawny, the female belly is yellowish white. Early spawning milky white, oblong. Old the mature larvae anal belly piece rear overlying the gross middle bristle column composed of long needle-like bristle, each column 15 18 the two barbed Tippy most meet each other and cross-the two bristle column parallel backend slightly diverge, the remote did not reach the front edge of the base of the hook and bristle columns ago. Early pupation milky white, pale yellow after the change.Black velvet beetles (Maladeraorientalis): Adults are oval, before narrowly after wide, black or dark brown velvet flash; lip base black, shiny, leading and trailing edge micro tilt middle longitudinal Long; chest backplane width, both sides of the middle of the outer expansion, dense, fine engraved point, the side edge of the column raw brown bristles; the elytra side edge micro curved edge with dilute short fuzz, longitudinal ribs. Eggs oval, milky white, smooth. Mature larvae of both sides of the cheek area above the antennae base with a circular dark spots (pseudo monocular), anal abdominal piece rear cover hair covered the top tip curved bristles, the leading edge of the Twin Peaks-like, the middle of the bare area of ​​the wedge-shaped, wedge pointed toward the tail, will cover the gross District split bristles, columns in the overlying gross margin, 16-22 root cone bristle, was cross-arc arrangement distinct break in the middle. Pupae from the pupa.[Occurrence]The the North China big black Melolonthidae: in Liaoning two years to complete a generation, Heilongjiang three years to complete a generation alternately wintering adults and larvae. Unearthed damage northeast southern overwintering mid to late May, followed spawning, larvae Sheng period in mid-July and mid-August on pupation, 10 months late third instar larvae overwinter.Diablo Melolonthidae: Huanghuai area a year on behalf of 20 cm at wintering in the ground to mature larva, a small number of adults can also be wintering. Overwintering larvae of the spring does not harm pupate in mid-May, the adult stage in early June to early August, Sheng period before and after mid-July, the larvae damage peak in late August. Pseudomonas beetle: one generation per year, overwintering larvae. Overwintering larvae unearthed infestation in Liaoning in mid-May, late June to pupate, the oviposition peak in mid-July, 8 September, the larvae Shengfa feeding peanuts, sweet potatoes, etc., until mid-October to aging The larvae overwinter. Overwintering larvae of the Huang-Huai River Basin in late March to early April and activities infestation, June pupation, adults occur in late May to early August, mid-June, adult Shengfa. 7 September for the larvae damage early October 3rd instar larvae soil wintering. Black velvet beetles: the area north of the Yangtze River in China for one year one generation to the adults overwinter. June 4 for adults with active, average temperature above 10 ℃ in May to start a large number of unearthed. August 6 for larval growth and development ofControl methodsDorsch decomposition of organic fertilizer, timely irrigation, prompting grubs transferred to the soil depths avoid seedling most vulnerable period. Before sowing seed dressing or soil treatment before sowing or transplanting worms can effectively reduce the amount; occurrence the damage period Pharmacy IRRIGATING of, but also can effectively control soil pests infestation.Before sowing seed dressing, you can use the following pesticides: 50% phoxim 0.5kg of water 20 to 25kg, the mixed seed 250 a 300kg; 40% methyl isobutyl isofenphos EC 0.5kg of water 15 a 20kg seed dressing 200kg; 4.4% of carbosulfan · tebuconazole suspension concentrates for seed 63 a 88g/100kg seed; 50% diazinon phosphorus EC the 100 a 200ml/100kg seed. Pharmacy with the following: 50% phoxim EC 200 a 250ml / acre 10 times, add water, spray 25-30kg fine soil mix into the toxic soil; 2% methyl isofenphos powder 3kg / 2 an acre plus 25 a 30kg the fine soil Bancheng poison the soil;3% carbofuran granules 2.5 a 3kg / acre, 5% two Diazinon granules 2.5 to 3kg / mu soil, along the ridge bar facilities, then shallow hoeing, or to spread the same amount of toxic soil in the seed furrow or ground , then plowing, or combination of irrigation facilities people. If grubs Occurrence and insects to the large amount of wheat seedling, you can use the following insecticides:3.5% flufenoxuron the · Profenofos EC. 90 a 120ml / acre; 40% chlorine Singh cream 250ml / mu; 48% chlorpyrifos EC 200ml / mu; 40% phoxim 500ml / mu; 40% Sulfotep EC 500ml / acre; 40% methyl isofenphos cream 250ml / mu; to 30 percent chlorpyrifos phoxim 600ml / 400 an acre, 40 to 50kg of water along the wheat ridge IRRIGATING.