GB/T 23391.3-2026Technical specification for the control of major corn diseases and insect pests - Part 3: Asian corn borer (English PDF)

4.3 Adult insect population survey

4.3.1 Survey period The first generation occurs in mid-May, the second generation in early May, the third generation in late April, and the fourth generation begins in mid-March, continuing until the final appearance of adults.

4.3.2 Light Lure Near a cornfield with healthy growth, install one automatic insect monitoring light (or a regular black light). There should be no tall buildings or other structures nearby. If obstructed by trees, the area should be kept away from streetlights and other light sources, with the bottom of the light tube at a vertical distance of

1.5 meters from the ground. Daily checks and statistics on Asian corn borers under the lights are necessary. Record the number of male and female moths, and note the meteorological data for that night. Record the initial, peak, and final stages of the emergence of each generation of moths. Based on the number and height of moths emerging. Peak period, predict the number of eggs and the occurrence of larvae in the field.

4.3.3 Sexual seduction Sex pheromone traps should be placed in weed beds or low-growing crop fields near cornfields, where the Asian corn borer inhabits and mates. Three bell-shaped funnel-type traps were placed on the field ridges for easy access. The traps were positioned at the bottom of the corn plant during the jointing stage. The traps should be placed 20cm above the crop canopy and 1.5m above the ground after the jointing stage; each trap should be at least 50m apart and arranged in a straight line along the field ridge. Its direction is perpendicular to the local monsoon wind direction.

4.4 Investigation of egg quantity and hatching status

4.4.1 Survey period Starting 5 days after the first appearance of adults in each generation, the number of eggs was investigated every 3 days until the last appearance of adults or eggs.

4.4.2 Survey Location Select two representative cornfields in the local area, each with an area of no less than

0.33 hm2, and designate them as systematic survey fields.

4.4.3 Survey Methodology Five samples were taken from each field diagonally, with 20 plants sampled at each point. During the initial survey, samples were taken every 3 days, recording the presence of corn borers on the underside of the leaves. The number of egg masses was recorded and marked for observation of parasitism, predation, and hatching during the next survey. Special attention was paid to the fully expanded upper and middle parts of the plant. blade.

7.1 Agricultural control

7.1.1 Straw Treatment In autumn and early spring of the following year, measures such as silage, crushing and returning straw to the field, composting, and using straw as fuel are taken to manage the straw of the main overwintering host crops. Take measures to reduce the initial number of insects.

7.1.2 Select insect-resistant (tolerant) varieties Choose corn varieties that are resistant to corn borers.

7.2 Physicochemical Induction Control

7.2.1 Light Lure During the adult emergence period, insecticidal lamps are set up in large contiguous corn-growing areas to attract and kill adult Asian corn borers. Each 1-3 hectares should be equipped with [insert lamp type here]. Place one insecticidal lamp.

7.2.2 Sex pheromone trapping During the adult emergence period, Asian corn borer sex pheromone traps should be set up in large, contiguous corn-growing areas. The traps should be placed on the ground. The habitat of the Asian corn borer includes well-grown wheat fields, bean fields, rice fields, vegetable fields, and weedy areas along field edges, spaced 30m to 50m apart. The insect inlet of the trap should be 1.2m to 1.5m above the ground. Replace the bait core as needed based on its effectiveness.

7.2.3 Mating Interference During the adult emergence period, mating interference release devices should be set up in clusters at their mating sites (wheat fields, bean fields, rice fields, vegetable fields, and weeds along field edges). Alternatively, release mating silks containing the sex pheromone of the Asian corn borer to interfere with adult mating.

7.3 Biological Control

7.3.1 Biological pesticides During the early stages of egg hatching or the early larval stages, biological pesticides are sprayed for control. The types of biological pesticides are listed in Appendix C, C.1.

7.3.2 Trichogramma wasps

7.3.2.1 Species of Trichogramma wasps Furthermore, select bee species that are suitable for the local area.

7.3.2.2 Bee Release Period When the pupation rate of the Asian corn borer reaches 15%~20%, add 10 days to the timeframe, or add 2 days after both male and female Asian corn borer moths are attracted by the monitoring lights. The best time to release bees for the first time is when the number of eggs per hundred bees in the field reaches 1 to 2 clusters (i.e., the early stage of egg laying).

7.3.2.3 Number of Bee Releases The Asian corn borer is released 2-3 times per generation. If a severe infestation of the current generation occurs, 3 releases are necessary. When releasing 2 releases, the interval should be... The interval is 7 days, and when releasing 3 times, it is 4 to 5 days.

7.3.2.4 Number of bees released Total bee population per generation. 225,000 bees/hm^2 for mild outbreaks, 300,000 bees/hm^2 for moderate outbreaks, and 450,000 bees/hm^2 for severe outbreaks. (2 cycles) When releasing bees, the first release should consist of 40% of the total bees, the second 60%, and for the third release, 20%, 50%, and 30% respectively. The number of bee clusters is 30 to 45 per hm2.

7.3.2.5 Bee Release Method Bees should be released on a sunny day, avoiding the time of day when high temperature and low humidity are most detrimental to Trichogramma bees. Bee cards should be placed directly on the fifth or sixth leaf of the corn plant. On the underside of 6 leaves. Agricultural drones directly deploy bee release devices.

7.4 Chemical control

7.4.1 Control agents For cornfields that have reached the control threshold, unified prevention and control measures should be implemented in contiguous areas, with targeted treatment for localized outbreaks. Commonly used chemical pesticides are listed below. C.2.Comply with the provisions of GB/T 8321.10.

7.4.2 The Art of Giving During the whorl stage of corn, apply granular pesticide to the whorl. During the heading stage, granules can be applied to the leaf axils of the node where the female ear grows, the leaf axils of the two leaves above and one leaf below the female ear, and the silks at the top of the ear.

7.4.3 Spraying method Apply pesticides in the early morning or evening when there is no wind or a light breeze, focusing on the whorl, tassels, or ears of corn. Use agricultural drones. When using aerial spraying, a flight control adjuvant should be added.

8.Archival Records The records include insect population monitoring, egg count, hatching rate, survey date, surveyor, species of Trichogramma wasps released, release date, release quantity, and release details. Establish traceable records by including information such as the person, type of pesticide, date of application, and the person who applied the pesticide. GB/T 23391.3-2026. Technical Specifications for the Control of Major Diseases and Pests of Maize Part 3. Asian Corn Borer ICS

15 National Standards of the People's Republic of China Replaces GB/T 23391.3-2009 Technical Specifications for the Prevention and Control of Major Diseases and Pests in Maize Part