There are mainly three kinds of golden needles that are very harmful to wheat.
First, D. gulmoides: It took 3 years to complete one generation in Beijing, and adults and larvae lived in the soil in winter. During the second year of wintering, the adults became active in March and April, mating, and spawning. In June, all eggs hatched. During the winter of the year and the second year, the larvae passed winter, and the third mature larvae larvae from early August to mid-September. Emerged as an adult at the beginning of September. It will not be unearthed in the year and winter in the earth room.
The second is the genus Chestworm: 1 in 2 generations in Shaanxi, 20 to 40 cm in winter under adult and larvae wintering, 2 in early March, 2 in late winter, and late winter in late September. Years or 3 to 4 years completes the phenomenon of 1 generation.
The third is Golden leafworm: 1st generation in 3 years. Adults and larvae are overwintering. The overwintering adult begins to excavate in early May. The spawning period is in the middle and middle of June. The 3rd instar larvae are wintered and the larval period is 2 years. In the third year of the year, from July to August, larvae were shed, and the adults did not exhume after winter.
All three kinds of golden needles are nocturnal. Chestworms have the ability to revive their heads and suspend deadly, and have a tendency toward odors of decaying plants.
The larvae of G. urticae are active and invasive at 10°C soil temperature of 10°C～18°C, and are suitable for arid regions. The suitable soil moisture is 15%～18%. The slim-lined larvae are suitable for lower temperature and 10 cm soil temperature. 7 °C ~ 12 °C is the prosperous period, more than 17 °C to stop the damage, to the deep transfer. Chest-breasted, adult gold leafworm requires higher soil moisture, about 20% to 25%.
First, D. gulmoides: It took 3 years to complete one generation in Beijing, and adults and larvae lived in the soil in winter. During the second year of wintering, the adults became active in March and April, mating, and spawning. In June, all eggs hatched. During the winter of the year and the second year, the larvae passed winter, and the third mature larvae larvae from early August to mid-September. Emerged as an adult at the beginning of September. It will not be unearthed in the year and winter in the earth room.
The second is the genus Chestworm: 1 in 2 generations in Shaanxi, 20 to 40 cm in winter under adult and larvae wintering, 2 in early March, 2 in late winter, and late winter in late September. Years or 3 to 4 years completes the phenomenon of 1 generation.
The third is Golden leafworm: 1st generation in 3 years. Adults and larvae are overwintering. The overwintering adult begins to excavate in early May. The spawning period is in the middle and middle of June. The 3rd instar larvae are wintered and the larval period is 2 years. In the third year of the year, from July to August, larvae were shed, and the adults did not exhume after winter.
All three kinds of golden needles are nocturnal. Chestworms have the ability to revive their heads and suspend deadly, and have a tendency toward odors of decaying plants.
The larvae of G. urticae are active and invasive at 10°C soil temperature of 10°C～18°C, and are suitable for arid regions. The suitable soil moisture is 15%～18%. The slim-lined larvae are suitable for lower temperature and 10 cm soil temperature. 7 °C ~ 12 °C is the prosperous period, more than 17 °C to stop the damage, to the deep transfer. Chest-breasted, adult gold leafworm requires higher soil moisture, about 20% to 25%.
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