What are the common diseases of rice, disease characteristics and control methods are?

What are the common diseases of rice, disease characteristics and control methods are?

The entire reproductive period of rice is divided into two major pests, namely, diseases and insect pests, rice common diseases are broadly divided into five kinds of rice blast, leaf blight, bacterial streak disease, blight, rice curculio, now on the symptoms of some of the common pests and diseases and prevention and control techniques to do an introduction to it.

I, rice blight 1.rice blight symptoms

Rice blight can be produced throughout the reproductive period, for seedlings, leaves, nodes, spike. The key to damage is the spike plague, produced in the spike neck, rachis, axillary buds and on the grain, spot pre-brown-black, slowly expanding up and down, forming a water stain-like spots, and then dark brown, spot length up to 3-4cm.

2. Prevention and control methods

Strictly carry out seed treatment; cultivate good varieties of disease resistance, fertilizer tolerance, yield increase, after the seed collection treatment process of diseased wheatgrass; strengthen the cultivation technology, reasonable dense planting, application of phosphorus and potassium fertilizer; the use of phosphorus and potassium. Application of phosphorus and potassium fertilizer; in the rice bud-breaking period 1 mu with 75% tricyclazole 30 grams of water 60KG spray.

Two, white leaf blight 1.white leaf blight symptoms

White leaf blight key for the leaves, from the tip of the leaf or the edge of the leaf gradually disease, the first dark-colored striped short spot, can be reached along the petiole to the leaf sheath, the formation of yellowish or grayish white long patterned spots, in the wet and cold temperatures, the spots on the yellowish dewdrop-shaped pus, drying out to honey yellowish fish seed-like.

2. Prevention and control methods

Promote inspection and quarantine, no wards from the introduction of rice seed; cultivate strong seedlings, seed disinfection, wheatgrass treatment; strengthen cultivation techniques, effective fertilizer, water injection, moderate sun field, can enhance the ability of the rice plant to resist the disease, alleviate the damage; in the peak of the spiking period, the spiking period of 1 mu with 20% of the leaf bluing 150 grams or 20% of the leaf green double 150 grams of 60KG of water to spray.

Three, bacterial streak disease 1.bacterial streak disease symptoms

Key for the leaves, the spot at first show dark green, water stains like a small point, and then along the petiole expansion into dark brown short stripes, surface adsorption of a lot of honey yellowish spherical pus, the leaf spots can be healed between each other into a block of stripes withered.

2. Prevention and control methods

Strict seed treatment; after the collection of seed treatment process good disease wheatgrass; strengthen cultivation techniques, reasonable dense planting, effective fertilizer, water injection, can enhance the ability of the rice plant resistance to disease, mitigation of the damage; drug prevention and control, in the peak period of spiking, the pregnancy of the spike, 1 mu with 20% of the leaf blighting 150 grams, or 20% of the leaf green double 150 grams of water to 60KG spray.

Four, blight 1.blight symptoms

Rice throughout the reproductive period can be produced, the first in the river near the petiole appeared water stain-like, dark green, edge is not clear small color spots, and then slowly expand into an elliptical into the clouds, the middle of the light green to black-brown.

2. Prevention and control methods

fishing kernel, rice field plowing and harrowing good water, most of the kernel floating in the river, mixed in the river "wave residue" within the wind gently blowing to the field corners and the field, you can use special tools such as a dustpan to catch the "waves of residue", get out of the field! Burying or drying damaged, can reduce the source of bacteria, delay time and alleviate the disease; strengthen the planting management methods, fertilizer methods should be used to fertilize the bottom fertilizer, early fertilization, to promote the early development, to prevent the middle and late growth; in the peak period of tasseling, 1 acre with 5% Jinggongmycin 100 grams of water to 60KG or 50% triazolone 100 grams of water to 60KG spray.

5, rice variegated disease 1.rice variegated disease symptoms

Rice variegated disease is only produced in the rice spike, for the damage to a single grain, as few as 1-2 grains, as many as more than ten grains, the damaged grain in the outer glume at the first crack, exposed small yellowish lumps, slowly Pangda wrapped in the outer glume on both sides of the cytosolic ball, gradually not too big, slowly Pangda, a little flattened, glossy, outside the cover of a layer of plastic film, accompanied by a cytosolic ball Pangda and cracked.

2. Prevention and control methods

The prevention of rice variegation is as follows: 1 mu with 100 grams of wellbutrin to 60KG of water in the rice bud-breaking period (i.e., 5 percent of the spike) for prevention and control, the rice Yang blooming period is strictly prohibited spraying.

Six, common rice pests are broadly divided into lice, stem borers, stick insects 1. rice fly

Rice fly

Rice fly Symptoms: Harming rice, so that the leaf blades become golden yellow and then wilted, if the larvae and larvae are clustered in the rice plant under the feeding pests, with the piercing sucking into the rice plant institutions, sucking in the sap, the amount of insects caused by the rice plant under the black, the collapse of the seedling, resulting in a serious limit or loss of yield. Preventive methods for ticks inhabiting, feeding ditch ridge grass must also be sprayed, the drug selection of any one of the following. (1) 25% lice, mu with 30 grams of water to 60KG sunny day spray. (2) rice lice net, mu with 30 grams of water 60KG sunny day spray.

2. Borer

Borer symptoms: larvae feeding on rice institutions. In the seedling and tillering period, from the tip of the rice stem infestation, resulting in withered heart seedling, invasion in the pre-budding period, resulting in withered pregnancy spike period, invasion in the late pregnancy and pre-spicing period, biting off the neck of the spike, resulting in white spikes. Prevention and control methods: (1) set prevention and control of the target field, in the egg mass oviposition of the beginning of the peak period gradually research green withered heart. (2) Set the appropriate time for prevention and control, and check the progress of egg mass oviposition. (3) Drugs, mu with 90% kill single 100 grams of water 60KG spray.

3. Stickleback

Stickleback Symptoms: Lepidoptera, Noctuidae. It is a kind of pest with long-distance migratory pest characteristics of the "outbreak". Mainly for rice, wheat, corn, sugar cane, but also for grass forage, wild dogwood, barnyard grass. It is also a predatory pest, feeding on leaves with larvae, when the leaves are lightly eaten into the lack of carvings, when most of the leaves are eaten up, and even bite off the neck of the ear, resulting in grain harvest. Prevention and control methods, choose 2.5% Kung Fu emulsion mu with 30 ml to 60 kg of water spray. If it rains 4 hours after spraying, it should be sprayed.