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Occurrence and Control Methods of Rice Dwarf Disease in Japonica Rice
I. Damage Symptoms The rice plant becomes stunted, with increased tillering, dark green leaves, and transparent yellowish-white dashed line streaks on young leaves and leaf sheaths. When the disease occurs at the seedling stage, tillering is reduced and the plant cannot head; when it occurs after booting, yellowish-white streaks appear only on the flag leaf or other leaf sheaths, and late-onset plants mostly produce neck-enclosed heads, small heads, many empty and shriveled grains, and a low seed-setting rate. II. Preventive Measures Once japonica rice contracts dwarf disease, it is very difficult to cure, so comprehensive preventive measures should be actively adopted. 1. Select disease-resistant
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How to control wheat aphids more scientifically? A detailed guide to practical methods
Wheat aphids are the type of pest with the largest annual occurrence area and the most severe damage in wheat. Although wheat aphids occur and cause damage year after year, farmers still have some misunderstandings in their control. How can wheat aphids be controlled more scientifically? It is recommended to pay attention to the following three points: 1. The appropriate time to start control. In general years, the appropriate time to start controlling wheat aphids (when the number of aphids per 100 plants rises to 500) is after wheat flowering (before grain filling), generally around May 5. Starting control at this time is best. As long as the right pesticide is used and the dosage meets the requirements, generally one control treatment can solve
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How to control rice thrips? Control methods and technical key points
(1) Life habits: The rice thrips is very small, with adults only 1 mm to 1.5 mm long, dark brown. In winter, adults overwinter in gramineous weeds and on wheat crops. During the seedling-raising period of the following year, when the seedlings grow to 2 to 3 leaves, they fly into the seedling fields to lay eggs and reproduce. The insect body is small and very active, able to fly and jump. Adults are attracted to green, and after the seedlings are transplanted, they enter the tillering stage when food is abundant, which facilitates massive egg-laying and reproduction, damaging the heart leaves and young tender tissues. In the early stage of leaf damage, small white spots appear, and the upper part of the leaf tip curls inward, causing
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A Complete Guide to Onion Thrips Damage and Control Methods
I. Distribution and Damage. Onion thrips, also known as tobacco thrips, cotton thrips, etc., belongs to the order Thysanoptera, family Thripidae. It mainly damages onions, scallions, garlic, Chinese chives, cucurbits, eggplant, Chinese cabbage, potatoes, and so on. Both adults and nymphs use their piercing-sucking mouthparts to suck the sap from tender tips and heart leaves of plants. Damaged scallions develop many fine, elongated grayish-white spots, the leaf tips turn yellow and dry up, and in severe cases the leaves become twisted and withered. II. Morphological Characteristics. Adult. Body length 1-1.3 mm, light yellow to dark brown, etc. Wings slender and transparent,
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How to control onion thrips? Mastering these methods is key
Onion thrips occurs throughout the country and is a pest with a wide range of host plants. To control onion thrips, first clean up the dead branches and fallen leaves thoroughly to eliminate the source of the pests. Second, water frequently to kill the nymphs and pupae in the soil. Third, once thrips appear in the field, carry out chemical spraying for control; omethoate, phoxim, fenvalerate and the like can be used. Spraying should be done in the early morning while the dew has not yet dried, to prevent the adult insects from escaping.
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Occurrence Patterns and Control Methods of the Ginger Stem Borer
The ginger stem borer (also known as the corn borer, belonging to Lepidoptera, Pyralidae) is a major pest harming ginger. It has a very diverse diet; when causing damage, the larvae bite and feed on tender stems, then bore into the stalks (with frass and insect droppings accumulating at the entry holes), blocking the transport of water and nutrients, causing the stems and leaves above the bore holes to turn yellow, wither, and droop, and making them extremely easy to break under external force. 1. Occurrence patterns. In our area, the ginger stem borer generally produces 3-4 generations per year, and the concentrated damage period coincides exactly with the vigorous growth period of ginger plants. The larvae move between plants to cause damage, and finally the mature
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How to control the jujube leopard moth? These methods you need to master
(1) Manual pruning of infested branches: during early spring pruning, cut off the damaged branches to eliminate the overwintering stages of the pest, and destroy them in a centralized manner. (2) Use black light traps to kill the adults during their emergence period from June to July. (3) Protect and make good use of natural enemy resources, such as braconid wasps, ants and birds. (4) Chemical control: inject 80% dichlorvos 200-fold solution into the entry holes, and seal the openings with mud.
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Causes and Control Methods of Peach Gummosis
Peach gummosis is a disease commonly found on peach trees today, and it occurs severely. Especially in poorly managed orchards and those with weakened tree vigor, the incidence of affected trees can reach over 90%. This disease severely weakens tree vigor, affects yield and quality, and in severe cases leads to branch and tree death, threatening the production and development of peach trees. It is also the most troublesome disease for fruit growers. I. Causes. There are two causes of peach gummosis: one is non-infectious pathogens, such as gummosis caused by wounds from mechanical injury, insect and disease damage, frost injury, freezing injury, etc., or gummosis caused by physiological disorders of the tree body due to extensive management, excessive pruning, excessive fruiting, improper fertilization, heavy clay soil, etc. The other is infectious pathogens caused by fungi, with the sexual stage belonging to Ascomycota and the asexual stage belonging to Deuteromycota.
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A Detailed Guide to the Harm Caused by the Jujube Leaf Beetle and Its Control Methods
The jujube leaf beetle belongs to the order Coleoptera, family Chrysomelidae. The larvae and adults of this insect damage jujube leaves and tender shoots. In outbreak years, the leaves are eaten bare, leaving only the bare fruiting branchlets, which greatly affects yield. The peak damage period for this insect is from mid-April to mid-May. Both larvae and adults damage jujube leaves, tender shoots, flower buds and flowers. Control methods: spraying mainly for flower protection is the primary approach. During the occurrence period of larvae and adults, spray 90% trichlorfon at 1500 times dilution or deltamethrin at 1.5 ten-thousand to 1.6 ten-thousand times dilution; generally the insecticidal effect is very good.
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A Detailed Guide to Silkworm Rearing Techniques and Disease Prevention and Control Methods
1. What should be noted when rearing third-instar silkworms? The third-instar stage lasts about 96 hours, of which about 72 hours are spent feeding on mulberry leaves and about 24 hours in molting. Physiologically, third-instar silkworms are still in the young-silkworm stage; their growth rate is slower than that of the first and second instars, their body weight increases 5 to 6 times compared with the second instar, and their adaptability to high temperatures differs somewhat from that of the first and second instars. During rearing, attention should be paid to: (1) The rearing temperature during the third instar is best at 25.5°C to 26°C, with a wet-bulb depression of 2°C to 3°C. (2) The mulberry leaves used in the third instar should be mature leaves, not
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