Application of ginger as repellent plant in prevention and control of spodoptera frugiperda

Abstract

The invention discloses an application of ginger as a repellent plant in prevention and control of spodoptera frugiperda. The invention finds that ginger has a good effect of repelling oviposition of spodoptera frugiperda and can be used for preventing and controlling the spodoptera frugiperda. At present, research reports for the spodoptera frugiperda repellents are not common, and the novel spodoptera frugiperda repellents extracted from plants are provided and have important guiding significance on green and efficient prevention and control of the spodoptera frugiperda.

Description

Technical Field

[0001] The invention relates to the technical field of pest control, and in particular to application of ginger as a repellent plant in preventing and controlling fall armyworm. Background Art

[0002] Fall armyworm, commonly known as fall armyworm, belongs to the genus Spodoptera of the family Noctuidae in the order Lepidoptera. It is native to tropical and subtropical regions of America. Fall armyworm has the characteristics of long-distance migration, wide host range, and strong reproductive capacity, causing serious economic losses to grain crops such as corn, wheat, sugarcane, and sorghum.

[0003] At present, chemical control is the main method for preventing and controlling fall armyworm, but chemical control has problems such as environmental pollution and causing pests to develop drug resistance. The combined control method of repellent and sex pheromone is an effective control method. The present invention proposes a control method of a repellent mixed with alarm pheromones of other types of pests and plant volatiles combined with a fall armyworm sex pheromone trap, which has important guiding significance for the green and efficient control of fall armyworm.

[0004] At present, the control of fall armyworm mainly relies on chemical control. However, due to the long-term and large-scale use of chemical pesticides, fall armyworm has developed resistance to many types of chemical pesticides, and the effectiveness of chemical control has significantly decreased. Therefore, the use of agricultural ecological control methods is urgent. Summary of the invention

[0005] The present invention aims to provide application of ginger as a repellent plant in preventing and controlling fall armyworm.

[0006] The present invention finds that ginger extract can effectively repel fall armyworms from laying eggs on corn plants, thus providing the use of ginger as a repellent plant in preventing and controlling fall armyworms.

[0007] Therefore, the present invention provides the use of ginger as a repellent plant in preventing and controlling fall armyworm.

[0008] Preferably, ginger is used to repel fall armyworm.

[0009] Preferably, the application is the application of ginger extract in repelling fall armyworm.

[0010] Preferably, the ginger extract is obtained by extracting ginger with n-hexane.

[0011] More preferably, the supernatant is obtained by centrifuging the n-hexane extract of ginger.

[0012] More preferably, the ginger extract is prepared by cutting ginger plants into pieces, extracting with n-hexane for 24 hours, and centrifuging at 8000 rpm to obtain the supernatant, which is the ginger extract.

[0013] A second object of the present invention is to provide a fall armyworm repellent containing ginger or a ginger extract as an active ingredient.

[0014] Preferably, the ginger extract is a n-hexane extract of ginger.

[0015] The third object of the present invention is to provide a method for repelling fall armyworm, which uses ginger or ginger extract to repel fall armyworm.

[0016] Preferably, the ginger extract is a n-hexane extract of ginger.

[0017] The present invention finds that ginger has a good effect on repelling the oviposition of fall armyworms and can be used to prevent and control fall armyworms. Currently, there are few research reports on fall armyworm repellents. The present invention proposes a new fall armyworm repellent extracted from plants, which has important guiding significance for the green and efficient prevention and control of fall armyworms. DETAILED DESCRIPTION

[0018] The following examples are provided to further illustrate the present invention, rather than to limit the present invention.

[0019] Embodiment 1:

[0020] 1. Potted egg-laying experiment: Choose different potted plants, 2 pots for each plant, and when the leaf areas of each plant are not much different, put them in a cage (100cm*100cm*50cm), and introduce 5 pairs of newly emerged adults of fall armyworm. Start to check the egg-laying amount of each plant and the cage from the 3rd day, clean up the eggs after each day's inspection, and check for 4 consecutive days, calculate the proportion of egg masses and eggs laid by female insects on each plant, and repeat 5 times.

[0021] Table 1 Egg laying of fall armyworm on different plants

[0022]

[0023] Note: Different lowercase letters in the table indicate significant differences

[0024] From the results in Table 1, it can be seen that fall armyworms prefer to lay eggs on corn plants, with egg masses and egg grains accounting for about one-third each. If the egg-laying amount on the cage is removed, the proportion of all plants is as high as about 40%. Therefore, corn is the fall armyworm's favorite egg-laying plant. Among the tested crops, the fall armyworm's egg-laying amount on soybeans and peas is second only to corn. Ginger is the plant that fall armyworms least like to lay eggs on, with the number of egg masses and egg grains laid less than 1%. Among the 5 repetitions, 4 repetitions did not lay eggs on ginger, and only 1 repetition laid an egg mass, totaling 42 eggs. Therefore, we believe that ginger can be used as a repellent plant for fall armyworms.

[0025] 2. Potted plant repellent experiment: A rectangular cage (150cm*50cm*50cm) was used. Four potted corns were placed on one side, and four potted corns and two potted gingers were placed on the other side. The ginger was placed in the middle of the corns. Five pairs of newly emerged adults of fall armyworm were placed. The number of eggs laid by fall armyworms on the corn plants on both sides was checked from the third day. The number of eggs laid by female insects on the corn plants on both sides and on the cage was calculated for five consecutive days. This was repeated five times.

[0026] Table 2 Effect of ginger intercropping on egg laying of fall armyworm on corn

[0027]

[0028] Note: Different lowercase letters in the table indicate significant differences

[0029] From Table 2, we can see that after intercropping corn with ginger, the amount of eggs laid on the corn plants is significantly lower than that of corn without intercropping, indicating that ginger can effectively repel the fall armyworm from laying eggs on corn plants.

[0030] 3. Ginger extract cage experiment: Cut the ginger plants into pieces and extract them with n-hexane for 24 hours. Centrifuge at 8000 rpm and take the supernatant (ginger extract) for the experiment. A rectangular cage (150cm*50cm*50cm) was built with 4 pots of corn on each side. On each pot of corn on one side, a rubber plug containing 100ul of n-hexane was hung. On each pot of corn on the other side, a rubber plug containing 100ul of ginger extract was hung. Five pairs of newly emerged fall armyworm adults were placed in each cage. Starting from the third day, the number of eggs laid by the fall armyworm on the corn plants on both sides was checked. The inspection was continued for 5 days, and the number of eggs laid by the female insects on the corn plants on both sides and on the cage was calculated. Repeat 5 times

[0031] Table 3 Effect of ginger extract on egg laying of fall armyworm on corn

[0032]

[0033] Note: Different lowercase letters in the table indicate significant differences

[0034] From Table 3, we can see that after corn was hung with ginger extract, the amount of eggs laid on the corn plants was significantly lower than that on the corn plants hung with the control, indicating that ginger extract can also effectively repel the fall armyworm from laying eggs on corn plants.

Claims

1. The application of ginger as a repellent plant in the prevention and control of fall armyworm.

2. The use according to claim 1, characterized in that: It is the application of ginger in repelling fall armyworm.

3. The use according to claim 1, characterized in that: The application is the application of ginger extract in repelling fall armyworm.

4. The use according to claim 3, characterized in that: The ginger extract is obtained by extracting ginger with n-hexane.

5. The use according to claim 4, characterized in that: The ginger extract is the supernatant obtained by centrifuging the normal hexane extract of ginger.

6. The use according to claim 5, characterized in that: The ginger extract is prepared by cutting ginger plants into pieces, soaking them in n-hexane for 24 hours, and centrifuging them at 8000 revolutions to obtain the supernatant, which is the ginger extract.

7. A fall armyworm repellent, characterized in that: Contains ginger or ginger extract as the active ingredient.

8. The fall armyworm repellent according to claim 7, characterized in that The ginger extract is a n-hexane extract of ginger.

9. A method for repelling fall armyworm, characterized in that: Ginger or ginger extract is used to repel fall armyworms.

10. The method according to claim 9, characterized in that The ginger extract is a n-hexane extract of ginger.

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