Abstract
Tillage operations can modify soil and plant characteristics where many insects reside dudag at least part of their life cycle. However, information relating tillage and subsoiling to soybean [ Glycine max (L.) Merr.] insect pests is very scarce or inconclusive. The objective of this study was to determine the effect of tillage and subsoiling on population cycles and densities of foliage‐inhabiting insect pests in soybean. Soybean was grown on a Norfolk sandy loam soil (fineloamy, siliceous, thermal Typic Kandiudult) and tillage treatments were (i) disk (no subsoil), (ii) disk (subsoil), (iii) conservation (no subsoil), and (iv) conservation tillage (subsoil). Planting curred immediately after disking or in conjunction with conservation tillage. Subsoiling consisted of a chisel plow located on a planter directly under the soybean row. Plots were sampled for insects by beating the soybean plants on both sides of the row onto a ground cloth. Population densities of velvetbean caterpillar (VBC), Anticarsia gemmatalis Hubner, increased at R4 and peaked at soybean Growth Stage R5.5; green cloverworm (GCW), Plathypena scabra (Fabricius) in 1985 and 1986 were greatest at Growth Stage R1 and R2.6, respectively, but remained low in 1987. Preplant tillage treatments usually caused no significant effect on the population dynamics of VBC or GCW. The population densities and cycles of southern green stinkbug (SGSB) nymphs and adults, Nezara viridula (L.), were similar for each preplant tillage treatment in 1985, 1986, and 1987. Since insect pests were not affected by tillage operations at planting, the tillage operation can be selected to promote beneficial insect predators that have shown to be favored by conventional tillage.
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Claims 6
Claim · model-written summary
Velvetbean caterpillar density rose at R4 and peaked at R5.5.
- Taxon
- soybean
Glycine maxe0 - Organ / stage
- Growth Stage R5.5e0
- Interactor
- Anticarsia gemmatalis Hubner
Anticarsia gemmatalise0pest - Outcome
- Population densities of velvetbean caterpillar (VBC)e0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Population densities of velvetbean caterpillar (VBC), Anticarsia gemmatalis Hubner, increased at R4 and peaked at soybean Growth Stage R5.5”
Claim · model-written summary
Green cloverworm density peaked at R1 in 1985 and R2.6 in 1986, and remained low in 1987.
- Taxon
- soybeanGlycine maxe1
- Interactor
- Plathypena scabra (Fabricius)e0pest
- Outcome
- green cloverworm (GCW)e0
- Direction
- greateste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“green cloverworm (GCW), Plathypena scabra (Fabricius) in 1985 and 1986 were greatest at Growth Stage R1 and R2.6, respectively, but remained low in 1987”
e1“soybean [ Glycine max (L.) Merr.]”
Claim · model-written summary
Preplant tillage usually had no significant effect on velvetbean caterpillar dynamics.
- Taxon
- soybeanGlycine maxe1
- Treatment
- Preplant tillage treatmentse0
- Interactor
- Anticarsia gemmatalis HubnerAnticarsia gemmatalise2pest
- Outcome
- population dynamics of VBCe0
- Direction
- no significant effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Preplant tillage treatments usually caused no significant effect on the population dynamics of VBC or GCW”
e1“soybean [ Glycine max (L.) Merr.]”
e2“velvetbean caterpillar (VBC), Anticarsia gemmatalis Hubner”
Claim · model-written summary
Preplant tillage usually had no significant effect on green cloverworm dynamics.
- Taxon
- soybeanGlycine maxe1
- Treatment
- Preplant tillage treatmentse0
- Interactor
- Plathypena scabra (Fabricius)e2pest
- Outcome
- population dynamics of VBC or GCWe0
- Direction
- no significant effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Preplant tillage treatments usually caused no significant effect on the population dynamics of VBC or GCW”
e1“soybean [ Glycine max (L.) Merr.]”
e2“green cloverworm (GCW), Plathypena scabra (Fabricius)”
Claim · model-written summary
Southern green stinkbug density and cycles were similar under each tillage treatment.
- Taxon
- soybeanGlycine maxe1
- Treatment
- preplant tillage treatmente0
- Interactor
- Nezara viridula (L.)
Nezara viridulae0pest - Outcome
- population densities and cycles of southern green stinkbug (SGSB)e0
- Direction
- similare0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The population densities and cycles of southern green stinkbug (SGSB) nymphs and adults, Nezara viridula (L.), were similar for each preplant tillage treatment in 1985, 1986, and 1987”
e1“soybean [ Glycine max (L.) Merr.]”
Claim · model-written summary
The authors suggest choosing tillage to favor beneficial insect predators.
- Taxon
- soybeanGlycine maxe1
- Outcome
- promote beneficial insect predatorse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the tillage operation can be selected to promote beneficial insect predators that have shown to be favored by conventional tillage”
e1“soybean [ Glycine max (L.) Merr.]”
The same questions in other papers
tillage · Anticarsia gemmatalis · Glycine max (soybean)Positive and negative results
1 in the opposite direction
- positive
tillage · pest · Glycine max (soybean)Positive and negative results
11 papers in the same direction as this paper · 14 in the opposite direction
- positive
- positive
- positive
22 papers more in this group
See all 26 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.