-
Occurrence and Control Methods of Powdery Mildew in Licorice
The pathogen is a type of imperfect fungus among the fungi, with the scientific name Erisiphepolygoni. It damages the leaves, and diseased leaves develop white powdery growth on both the upper and lower surfaces. For control, spray 0.2-0.3 degrees Baume lime sulfur mixture.
-
Occurrence Patterns and Control Methods of Silkworm Muscardine
Silkworm muscardine, also known as hardening disease, is a silkworm disease caused by fungal parasitism. The bodies of diseased silkworms dry out and harden, with mycelium and conidia growing on the body surface. Because the bodies of diseased silkworms produce spores of different colors on the outside, the disease can be divided into white muscardine, green muscardine, yellow muscardine, gray muscardine and brown muscardine, among which white muscardine is the most common. There are two routes of infection: contact infection and wound infection. In both cases, pathogen spores attach to the surface of the silkworm body through media such as air and mulberry leaves, then penetrate into the silkworm body and parasitize it. If not controlled in time, it spreads very quickly and the mortality rate is relatively high.
-
Occurrence and Control of the Comstock Mealybug in Bagged Pear Orchards
One of the main pests that enter the bag. The calyx depression and stem depression are the most severely affected. Purple-red halos appear at the damaged spots, growth stops, and deformed fruit forms; in severe cases, the fruit surface cracks and dries up. This pest generally has 3 generations per year, mainly overwintering as eggs or 1st to 2nd instar nymphs on branches and mummified fruit, with a few overwintering as fertilized females; when the pear tree buds in the following spring, the eggs hatch into nymphs. Activity begins in April of the following year, the first generation reproduces in May-June, the second generation in July-August, and the third generation in September-November. Pesticides with good control efficacy against this pest include 40% omethoate
-
Occurrence Patterns and Control Methods of the Rice Water Weevil
The rice water weevil is an internationally recognized quarantine pest of agricultural plants. It first occurred in the Americas. In Asia, the countries where it occurs include Japan, South Korea, North Korea, and others. The place where the rice water weevil was first discovered in China was in 1987 in Tanghai County, Hebei Province. The area where the rice water weevil was first discovered in our province was in August 1993 in Ji'an City in the Tonghua region. At present, most areas of our province have this pest to varying degrees. I. Damage level of the rice water weevil. The rice water weevil mainly damages rice and also damages some grass
-
Occurrence Patterns and Control Methods of the Rice Water Weevil
The rice water weevil is an internationally recognized agricultural plant quarantine pest. It first occurred in the Americas, and the countries in Asia where it occurs include Japan, South Korea, North Korea, and others. The place where the rice water weevil was first discovered in China was Tanghai County, Hebei Province, in 1987. The area where the rice water weevil was first discovered in our province was Ji'an City in the Tonghua region in August 1993. At present, this pest occurs to varying degrees in most areas of Heilongjiang Province. I. Degree of damage caused by the rice water weevil. The rice water weevil mainly damages rice, and also damages some
-
Occurrence Patterns and Control Methods of Rabbit Necrobacillosis
I. Symptoms The sick rabbit loses its appetite, salivates, and develops hard nodules on the lips, oral mucosa, and gums, which then become necrotic and foul-smelling. The swellings sometimes occur on the neck, chest, face, or front of the chest, forming abscesses or ulcers. After the lesions rupture, a foul-smelling discharge flows out, and the course of the disease lasts as long as several weeks or months. The rabbit dies from elevated body temperature, emaciation, and exhaustion. II. Prevention and Control 1. Prevention: Rabbit cages should be free of sharp foreign objects to prevent biting and fighting and to prevent skin injuries. Rabbits should be bred and raised on the farm itself. Breeding rabbits introduced from other places must be isolated and quarantined for 1 month and may only be mixed into the group if they have no other diseases.
-
Measures and Methods to Prevent the Occurrence of Three-Molt Silkworms
At present, most of the silkworms reared in our province are four-molt silkworms. Under normal incubation and rearing conditions, a four-molt silkworm should undergo four molts in one generation. However, if the incubation and rearing conditions are poor, a four-molt silkworm may undergo only three molts in one generation, resulting in reduced mulberry leaf consumption, smaller cocoon shape, and lower yield. The reasons why four-molt silkworms undergo only three molts include: incubation under low temperature, dry conditions and darkness at around 20°C; exposure to more than 12 hours of light per day during the young silkworm stage; feeding mulberry leaves that are too tender or too high in protein; after the silkworm eggs are brought back, they are not kept warm and protected, and are directly placed at natural temperature for supplementary incubation, resulting in excessively long supplementary incubation time and accumulated temperature failing to reach the standard;
-
Occurrence and Control Methods of the Pear Yellow Pink Aphid
I. Distribution and Damage. It occurs commonly in the northern regions of China and only damages plants of the genus Pyrus. This pest mainly damages the fruit by adults and nymphs gathering at the calyx depression of pear fruits to feed, and it also damages other parts. The surface of the damaged peel initially shows small yellowish, slightly sunken spots, which later gradually turn black and expand outward in wavy rings, often forming cracked large black scars and even causing fruit drop. II. Occurrence Pattern. The pear yellow pink aphid generally has 8 to 10 generations per year, overwintering as eggs on fruit spurs, in bark crevices, under the raised bark damaged by the pear bark miner moth, and on debris attached to branches and trunks. The following
-
A Detailed Explanation of the 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 mixed diet; when causing damage, the larvae bite and feed on the tender stems, then bore into the stem (with frass and insect droppings accumulating at the entry hole), blocking the transport of water and nutrients, causing the stems and leaves above the bore hole to turn yellow and wilt, and they break very easily under external force. 1. Occurrence patterns. The ginger stem borer generally occurs 3-4 generations per year in our area, and the concentrated damage period coincides exactly with the vigorous growth period of the ginger plants. The larvae move from plant to plant causing damage, and finally the mature larvae
-
Occurrence Characteristics and Control Methods of Mushroom Gall Midge
I. Morphological Characteristics The gall midge, also known as the small red maggot or mushroom gnat, has adults that resemble small mosquitoes, tiny and delicate, difficult to see with the naked eye. The head, thorax, and dorsal side of the body are dark brown, while the rest is grayish-brown or light orange. Larvae can hatch from eggs or be reproduced by the mother's larvae. Each female can produce an average of more than 20 larvae. In the early stage, larvae cause damage in the substrate, resulting in sparse and weak mycelium. In the later stage, they move to the mycelium and fruiting bodies. When fruiting bodies are damaged, they first breed at the base of the mushroom stipe, then climb to the junction between the stipe and the cap, and some bore into the gills, which are eaten into scars and trails, appearing light orange-red. A single mushroom can host 20 to 30 larvae in severe cases, seriously affecting the quality and yield of mushrooms.
条件筛选