Spodoptera frugiperda : Is a species of moth in the genus Nocturnidae in the family Noctuidae. The grassland nightcrawler is an exotic species, which was not found in China, and was first distributed mainly in the warm climate of the Americas, but it can migrate and spread to all parts of the United States every year. Later, the meadow moth was introduced to Africa, and in two years, the grassland moth caused a devastating blow to Africa's agriculture. In January 2019, the grassland night moth was introduced from India and Southeast Asian countries to China's Yunnan Province, where it broke out in China and overwintered and colonized in South China.
In 2020, the grassland night moth may fully erupt, and the estimated area is 100 million mu, and the prevention and control situation is very grim!
According to expert analysis and prediction, in 2020, the continuous migration of overseas insect sources and the growth of local insect sources will lead to the population of the nightcrawler far exceeding the northward migration of insect sources in 2019.
In addition, in 2020, the time for the insect source to migrate to the Yangtze River Basin in the spring will be about one month earlier than in 2019. Correspondingly, the time for it to spread to the Huang-Huai-Hai region and the northeast region will also be advanced. At this time, it is the seedling stage of summer corn in Huanghuaihai and the new leaf period of spring corn in the north. Therefore, the harm it causes may be greater than in 2019, and the prevention and control of the grassland night moth is like a "worm ration" war.
Adults of the grassland nightcrawler are nocturnal and lay about 100 eggs on top of the leaves of the plant, and the egg stage is at a temperature of 25 ° C for 3 days. The newly hatched larvae feed on the egg shell itself and then let stand for 2-10 hours. Larvae, or caterpillars, prefer to feed on new leaves, and due to their eating habits, they usually find a new leaf each. The larvae change the skin seven times and at the last time leave the ink sac, penetrating the soil 0.5 cm deep, where they become pupae. The pupal stage lasts about 10-12 days during the hottest period of the year. The lifespan of an adult worm is about 12 days, and the full cycle of this pest is only 30 days.
Meadow nocturnal moth
Spodoptera frugiperda
Also known as: meadow moth, pseudo-armyworm, autumn marching insect, autumn armyworm, grassland night moth
Genus Animal Kingdom, Arthropod Phylum, Hexapod subphylum, Insecta, Pteropodidae, Lepidoptera, Noctuidae, Gray-winged Noctuidae
01
----- Harm corn -----
02
----- Adult -----
<h3 class= "pgc-h-arrow-right" > female adult</h3>
<h3 class = "pgc-h-arrow-right" > female adult (spread wings</h3>).
< h3 class = "pgc-h-arrow-right" > female adult (lateral</h3>).
<h3 class = "pgc-h-arrow-right" > female adult (ventral spread).</h3>
<h3 class = "pgc-h-arrow-right" > female adult (ventral).</h3>
< h3 class = "pgc-h-arrow-right" > male and female adults on the heart leaves of corn</h3>
< h3 class = "pgc-h-arrow-right" > male adults (live insects on corn).</h3>
< h3 class = "pgc-h-arrow-right" > male adults</h3>
< h3 class = "pgc-h-arrow-right" > male adult (soon feathered</h3>).
<h3 class = "pgc-h-arrow-right" > male adults (ventral surface, incomplete feet).</h3>
< h3 class= "pgc-h-arrow-right" > male adults</h3>
Emerged adults
03----- Eggs -----
<h3 class= "pgc-h-arrow-right" > egg (flattened bottom).</h3>
04----- Larvae -----
<h3 class = "pgc-h-arrow-right" > larvae 1-6 years old, pre-pupae</h3>
< h3 class = "pgc-h-arrow-right" > 1 instar larvae</h3>
<h3 class = "pgc-h-arrow-right" > 2nd instar larvae (ventral, dorsal, lateral).</h3>
< h3 class = "pgc-h-arrow-right" > 3-year larvae (ventral, dorsal, lateral).</h3>
< h3 class = "pgc-h-arrow-right" > 4-instar larvae (ventral, dorsal, lateral).</h3>
< h3 class = "pgc-h-arrow-right" > 5 instar larvae (ventral, dorsal, lateral).</h3>
< h3 class = "pgc-h-arrow-right" > 6-year-old larvae (ventral, dorsal, lateral).</h3>
<h3 class="pgc-h-arrow-right" > old mature larvae</h3>
<h3 class = "pgc-h-arrow-right" > pre-pupae (ventral, dorsal, lateral).</h3>
<h3 class = "pgc-h-arrow-right" > larvae (inverted Y-spotted spots on the head).</h3>
Larvae (4 dark spots arranged in a square arrangement at the end of the abdomen)
Larvae (anterior part of the head and mouthparts)
Larvae (thoracic and gastropods)
Larvae (gastropode hook)
05----- Pupae -----
Pupae (progression)
<h3 class = "pgc-h-arrow-right" > pupae (dorsal, ventral, lateral).</h3>
<h3 class="pgc-h-arrow-right" > pupal shell</h3>
<h3 class= "pgc-h-arrow-right" > pupae</h3>
<h3 class = "pgc-h-arrow-right" > pupae (figure-of-eight gluteal spines with no barbs or bends at the ends of the gluteal spines).</h3>
<h3 class= "pgc-h-arrow-right" > pupae (valve opening backwards).</h3>
Pupal chamber
06----- Parasitic fly -----
<h3 class = "pgc-h-arrow-right" > parasitic flies in pupae (adult parasitic flies, parasitic fly pupal shells, parasitic grass moth pupae).</h3>
<h3 class = "pgc-h-arrow-right" > a parasitic pupae in the grass nocturnal moth pupae</h3>
< h3 class= "pgc-h-arrow-right" > adult parasitic flies</h3>
<h3 class = "pgc-h-arrow-right" > parasitic and dead larvae of the grassland moth</h3>
<h3 class = "pgc-h-arrow-right" > parasitic larvae of the grassland moth</h3>
07----- Habits -----
Habits (young spinners)
Habits (large amount of food, high feces)
Habits (1-2 larvae of an elderly larvae in a corn plant, often hidden in more hidden places such as heart leaves during the day)
Habits (mouse larvae no longer feed, often move to the ground, burrow into shallow soil to prepare pupate)
< h3 class = "pgc-h-arrow-right" > habit (pre-pupae for old mature larvae).</h3>
Suspended animation
Source: Agricultural Technology Extension in China