Asparagus is delicious but difficult to plant, because asparagus pests are more pests, to pay close attention to, mainly brown spot, stem blight, anthrax, stem rot, nocturnal insect pests, aphids, thrips, etc.. In cultivation and management, we must focus on the prevention and control of these pests and diseases. 1. Brown spot: The stems, branches and mimicry leaves of asparagus are mainly damaged, but they are mainly twigs and mimicry leaves. Severe disease often causes premature death of plants. Control measures: Use 75% chlorothalonil and 50% carbendazim to administer the above-mentioned agents into 500 to 800 times liquid for spraying. Normally, spray once every 10 days or so, and the onset period can be sprayed once every 7 days. 2, stem blight: The disease occurs mainly in the stem, lateral branches or leaves. The spots are swollen or short-lined around the hydrophilic edges and show edema. Prevention and control measures: The principles of prevention and comprehensive prevention should be adhered to. Use suitable planting fields; thoroughly clean the garden, remove diseased plants in time, timely pruning; pay attention to drought resistance and drainage; rational fertilization; do a good job in field management. Chemicals prevention and control should implement the principle of “prevention over treatmentâ€. After the tender stems are sprayed, they must be sprayed in time to receive good results. Chemical control: When the length of the new mother's stem is 15 cm, apply 50% carbendazim to the stem. After the occurrence of branching of the mother stem, every 7 to 10 days, alternately use the following liquid spray once: 32.5% Asparagus Green No. 2 600 times liquid; 50% carbendazim 500 times; 50% isoniacilil 1000 ~ 1500 times; 70% thiophanate-methyl 700 times. 3, anthrax: The main damage stems, lesions gray to light brown, fusiform or irregular shape, late Minister of disease out of a small black spots. Control methods: timely removal of diseased bodies during harvest, concentrated deep-buried or burned; application of organic fertilizer; pay attention to drainage after rain, prevent severe flooding, watering should be arranged in the morning to reduce night condensation; early onset Spray 70% mancozeb WP 500 times, 75% chlorothalonil wettable powder 600 times, spray once every 5 to 7 days, continuous control 2 or 3 times, withdrawal 7 days before harvest. Second, the main pests: 1, nocturnal pest control methods: trapping adult insects, black light or sweet and sour liquid can be trapped; chemical control should be scattered in the first instar larvae are not dispersed or not buried in the spray, when the age of resistance is very strong It is often difficult to kill. Generally, it is predicted that the spraying effect will be the best 4 to 5 days after the spawning peak. Spraying in the evening is better than in the daytime. The available medicines are: 90% trichlorfon crystals 1000 times, 40% Lexus 1000 times, and 5% antibiotics 1000 times. 2. Aphids and Thrips: Control methods: Clean the garden, diligent weeding, timely irrigation; Chemical control can be used 25% chrysanthemum mixture 2000 times, 50% dichlorvos 1000 times, 10% imidacloprid 1000 ~ 1500 times spray. 3, wolfberry: with 90% trichlorfon 30 times liquid mixing, the amount of water, mixed with the tide for the degree of application of 1.2 to 2.5 kg per acre, in the evening wind and sultry applicator the best effect. Use 1 kg of 3% phoxim granules and mix 3 kg of fine sand in the seedbed.
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