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Two-point Noctuidae belongs to Lepidoptera, Noctuidae
.
Distributed in Japan, the Korean Peninsula, Russia, Europe and other places
.
In 2005, it sneaked into Hebei Province of China from Japan and North Korea for the first time.
It is a new pest that damages corn; it happened sporadically in Dezhou, Shandong Province in 2007; in July 2008, an adult of Spodoptera litura was found in Xinxiang City, Henan Province; The damage has been gradually expanded over the years
.
Since late June 2011, activities have been rampant in Henan, Shandong, Hebei, Anhui, Jiangsu, Shanxi and other places, damaging summer maize seedlings
.
In July 2014, our district first discovered the two-spot moth under the forecast light
.
? Recognizing features? Adults are 1-1.
2 cm long, gray-brown or yellow-brown
.
There are two black spots on the forewings, and a small white spot is next to the outer black spot
.
Individuals are significantly smaller than cutworms and cotton bollworms
.
The larvae are mainly 5 instars, and some are 6 instars
.
The body length of the mature larva is 1.
4-2.
0 cm, yellow-gray or dark brown.
Each body segment has an inverted "triangular" dark brown marking.
The important feature is that the two brown dorsal lines on the abdomen disappear to the thoracic segment
.
The valve is black, the upper line is dark brown, and the lower line is white
.
The larva was disturbed and shrank into a "C" shape
.
Before the pupation of mature larvae, the body segments are shortened and more rigid and inactive
.
? Occurrence pattern? At two o'clock, the moth occurs 2 generations a year
.
Adults have phototaxis.
The first peak period-the peak of overwintering adult worms appears from early June to early July.
The larvae that lay eggs will harm summer maize seedlings from the end of June to the beginning of July, which is a critical period for prevention and control; mid-July From late to early August, the second peak period-the peak of the first generation of adults appears, and its larvae bite off the secondary corn roots and damage them
.
? Harmful characteristics? 1.
After corn sowing, gnaw corn seeds
.
2.
At the 2-3 leaf stage of corn, bite the corn seedlings into holes and gnaw the base of the corn stems into pits
.
3.
In the 3-5 leaf stage of corn seedlings, the larvae mainly eat the base of the corn stem, forming 3-4 mm round or oval holes, cutting off nutrient delivery, and causing the corn heart leaves above the ground to wilt and die
.
4.
In plots with large corn seedlings (8-10 leaf stage), larvae mainly bite off the roots of corn, including aerial roots and taproots, causing corn to fall, and in severe cases, it will die, resulting in seedling shortage and ridge breaking
.
Forecast basis? 1.
Moth quantity: As of May 22, 10 adults were trapped under the lights of our station, and the first sighting day was April 30.
Among them, on May 5th and 10th, there were 3 moth traps each
.
2.
Meteorological factors: According to the forecast of the Provincial Meteorological Center, the rainfall in May is relatively low and the temperature is relatively high, which is not conducive to the hatching of eggs and the survival of larvae; the rainfall in June is relatively high and the temperature is relatively high, which is beneficial to the damage of larvae
.
? Farmer friends are requested to pay attention to the insect situation of Noctuidae in a timely manner, and take emergency control measures in case of damage to ensure the healthy growth of corn plants
.
? Prevention and control technology? 1.
Agricultural measures
.
Remove the mulch at the base of the maize seedling in time when the maize emerges to eliminate the conditions for its occurrence; when the dead seedlings appear in the field, the seedlings should be refilled in time, and the large fallen seedlings should be cultivated in time to support the seedlings
.
? 2.
Traps and kills adults
.
In the period of high incidence of adults, use insecticidal lamps, sweet and sour liquid, and poplar branches to trap and kill adults to reduce the number of adults
.
? 3.
Chemical control
.
Use chlorpyrifos, chlorpyrifos, phoxim and other agents to control adult insects, spray or irrigate larvae with chlorpyrifos, phoxim, indoxacarb, etc.
, use emamectin benzoate, chlorpyrifos, dichlorvos, phoxim, indoxacarb and other poison baits Booby
.
Larvae control is best implemented before 3rd instar when there are 3-4 larvae per 100 larvae
.
.
Distributed in Japan, the Korean Peninsula, Russia, Europe and other places
.
In 2005, it sneaked into Hebei Province of China from Japan and North Korea for the first time.
It is a new pest that damages corn; it happened sporadically in Dezhou, Shandong Province in 2007; in July 2008, an adult of Spodoptera litura was found in Xinxiang City, Henan Province; The damage has been gradually expanded over the years
.
Since late June 2011, activities have been rampant in Henan, Shandong, Hebei, Anhui, Jiangsu, Shanxi and other places, damaging summer maize seedlings
.
In July 2014, our district first discovered the two-spot moth under the forecast light
.
? Recognizing features? Adults are 1-1.
2 cm long, gray-brown or yellow-brown
.
There are two black spots on the forewings, and a small white spot is next to the outer black spot
.
Individuals are significantly smaller than cutworms and cotton bollworms
.
The larvae are mainly 5 instars, and some are 6 instars
.
The body length of the mature larva is 1.
4-2.
0 cm, yellow-gray or dark brown.
Each body segment has an inverted "triangular" dark brown marking.
The important feature is that the two brown dorsal lines on the abdomen disappear to the thoracic segment
.
The valve is black, the upper line is dark brown, and the lower line is white
.
The larva was disturbed and shrank into a "C" shape
.
Before the pupation of mature larvae, the body segments are shortened and more rigid and inactive
.
? Occurrence pattern? At two o'clock, the moth occurs 2 generations a year
.
Adults have phototaxis.
The first peak period-the peak of overwintering adult worms appears from early June to early July.
The larvae that lay eggs will harm summer maize seedlings from the end of June to the beginning of July, which is a critical period for prevention and control; mid-July From late to early August, the second peak period-the peak of the first generation of adults appears, and its larvae bite off the secondary corn roots and damage them
.
? Harmful characteristics? 1.
After corn sowing, gnaw corn seeds
.
2.
At the 2-3 leaf stage of corn, bite the corn seedlings into holes and gnaw the base of the corn stems into pits
.
3.
In the 3-5 leaf stage of corn seedlings, the larvae mainly eat the base of the corn stem, forming 3-4 mm round or oval holes, cutting off nutrient delivery, and causing the corn heart leaves above the ground to wilt and die
.
4.
In plots with large corn seedlings (8-10 leaf stage), larvae mainly bite off the roots of corn, including aerial roots and taproots, causing corn to fall, and in severe cases, it will die, resulting in seedling shortage and ridge breaking
.
Forecast basis? 1.
Moth quantity: As of May 22, 10 adults were trapped under the lights of our station, and the first sighting day was April 30.
Among them, on May 5th and 10th, there were 3 moth traps each
.
2.
Meteorological factors: According to the forecast of the Provincial Meteorological Center, the rainfall in May is relatively low and the temperature is relatively high, which is not conducive to the hatching of eggs and the survival of larvae; the rainfall in June is relatively high and the temperature is relatively high, which is beneficial to the damage of larvae
.
? Farmer friends are requested to pay attention to the insect situation of Noctuidae in a timely manner, and take emergency control measures in case of damage to ensure the healthy growth of corn plants
.
? Prevention and control technology? 1.
Agricultural measures
.
Remove the mulch at the base of the maize seedling in time when the maize emerges to eliminate the conditions for its occurrence; when the dead seedlings appear in the field, the seedlings should be refilled in time, and the large fallen seedlings should be cultivated in time to support the seedlings
.
? 2.
Traps and kills adults
.
In the period of high incidence of adults, use insecticidal lamps, sweet and sour liquid, and poplar branches to trap and kill adults to reduce the number of adults
.
? 3.
Chemical control
.
Use chlorpyrifos, chlorpyrifos, phoxim and other agents to control adult insects, spray or irrigate larvae with chlorpyrifos, phoxim, indoxacarb, etc.
, use emamectin benzoate, chlorpyrifos, dichlorvos, phoxim, indoxacarb and other poison baits Booby
.
Larvae control is best implemented before 3rd instar when there are 3-4 larvae per 100 larvae
.
