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Tube top spot in the Shanghai area beetles Occurrence and control of Preliminary Report

Listed more than 50 days in advance, mu yield was 1033kg, economic efficiency increased by 1.5 times. l lay the foundation selected choice early in the mature seed varieties, such as' Baoying purple circle, 2 ahead of contention early seedling planted on March 15, the city Although the average temperature stable at 10 ℃, but still can not meet the minimum growth temperature of Arrowhead, we use a small Gongpeng holding nursery. method is to select the Leeward sunny, fertile soil of land, things to Zuoqi, Qikuan lm, water wetting the soil, cutting by 10 ~ 12an spacing arrowhead terminal bud, later kept the soil moist. Cutting the day the beds in the nursery about east-west direction with a per lm 1.8 ~ 1.9m at both ends of the bamboo pieces into the soil, depth 15 ~ 20cm, bent arch, elevated 0.5 ~ 0.6m, 2m wide coverage of agricultural film, north and south sides with soil compaction, something ends with a brick subdue, warming sun during the day. night plus straw mat insulation. seedling period to maintain Pengwen 20 ~ 30 to reveal two things ventilation, night temperature of l5 ℃ or more,[link widoczny dla zalogowanych], is not covered straw mat. city has been broken in late April frost, planting at field level to be 3. transplanting time, rational close planting April 29,[link widoczny dla zalogowanych], arrowhead with stereotypes about 6 leaves, it will be hardened by the arrowhead in a timely manner after the planting in the field. transplanting plots with high levels of fertility size 40cm × 40cm, low fertility plots was 35cm × 35cm. 4 scientific fertilization, coordination Nutrition colonization, the quality of manure applied per acre based 3ooo ~,[link widoczny dla zalogowanych], high concentrations of sulfur-based compound fertilizer 20kg; ammonium bicarbonate Mushi week after transplanting trees 25kg fat for fat; in mid-July, the ball into the end of,[link widoczny dla zalogowanych], Mushi 45% of the 1313 fertilizer l0kg fertilizer for cabbage; July 20 dwarf seedlings sprayed with strong foliage top dressing for chemical control. mu Huolisu lOOg, short Miao Zhuang 50g, watered 40--501 ~ spray. 5 good water slurry, Miao Jian Long life to help uphold the arrowhead shallow, deep, shallow irrigation principles. 2 ~ 3cm after transplanting to maintain a thin layer of water, live trees after irrigation 10 ~ 15cm, deep-fat trees, cabbage period, the irrigation shallow water 3 ~ 5cm and often alternating wet and dry, increase soil aeration, promoting bulb enlargement. 6 pest control, pest control hazards mainly against aphids arrowhead, mainly smut disease. There aphid strain rate of l5 ~ 20% when EC of 40% dimethoate spraying times l50o ~ 20o0; smut early onset with 25% Triadimefon WP 1000 times spraying 7 to 10 days, then 25% of the spraying of carbendazim 500 times. are the temperature has reached about 20 ℃, thrown off all the hardened film about a week, Received Date :2002-1-26 .''('('<inspection, methamidophos and omethoate better control effect liquid (see Table 2). wrapped two beetles bored cylinder injection spot investigation Wu Jing dark box Craftiness 3 Discussion 3.1 by the end of June early July, the beginning of newly hatched larvae within the young shoots on the Zhushi, then sprayed with high penetration of drugs, easy to penetrate into the young shoots, the poison tip within the larvae, is the proper time of spraying. recommended spray 1j MG 1, 2 or 3 consecutive -96 time, can kill most of the larvae. 3.2 hole injection control with long residual period of limitation, labor, less medication, and suitable for the larvae hatch in early phases. methamidophos drilling test is at 8 3 May check July 14 for the test injection of several anti-drilling efficiency of pesticides are not very ideal circumstances do make a test (this time the larvae have been boring into the wood inside the branches, reached larvae body length 23mm about significantly increased resistance). injection 2 weeks after the inspection, the larval mortality rate can reach 71%, if the injection in the larvae incubation period, the effect is estimated to be better. methamidophos in Shanghai and is currently banned in Omethoate the use of fruits and vegetables and other crops, but Hongye Li is the ornamental garden plants, combined with less medication, as long as protective measures are in place, less impact on the environment and human body, prevention and treatment plants in the garden can be used as an emergency drug selection. At present beetle control tube top spot hazards, pests cut off the tip is still timely and better, and easy means of prevention.
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