Abstract
Laboratory and field experiments showed that the virus which causes polyhedrosis of the cabbage looper (Trichoplusia ni (Hbn.)) is a highly virulent pathogen. In laboratory tests an oral dosage of 0.001 ml. of an inoculum prepared by triturating the body contents of one virus-killed fifth-instar cabbage looper in 16 liters of water caused infection and death of all larvae treated. Field tests on cabbage, cauliflower and broccoli were conducted in which virus-killed cabbage loopers were triturated in water and applied at rates from 0.94 to 120 larvae per acre with a low volume sprayer applying 30 gallons per acre. In all of the four field experiments it was possible to initiate a polyhedrosis epidemic and thereby greatly reduce the cabbage looper population in such test plots. Although increased dosage caused more rapid disease progress, a dosage of 0.94 larva per acre initiated a polyhedrosis epidemic. Six months storage of the inoculum at 0° F. did not cause any apparent reduction in pathogenicity nor was there any adverse effect noted when TEPP or spreader-sticker (Rohm & Haas B-1956) was added to the inoculum when applied.
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Claims 7
Claim · model-written summary
A minute oral virus dose infected and killed all treated cabbage looper larvae.
- Taxon
- cabbage, cauliflower and broccoli
Brassica oleracea var. botrytis
Brassica oleracea var. capitata
Brassica oleracea var. italicae1 - Treatment
- an oral dosage of 0.001 ml. of an inoculume0
- Interactor
- cabbage looper
Trichoplusia nie0pest - Outcome
- infection and death of all larvaee0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“an oral dosage of 0.001 ml. of an inoculum prepared by triturating the body contents of one virus-killed fifth-instar cabbage looper in 16 liters of water caused infection and death of all larvae treated”
e1“Field tests on cabbage, cauliflower and broccoli”
Claim · model-written summary
Virus application initiated epidemics and greatly reduced cabbage looper populations in all four field experiments.
- Taxon
- cabbage, cauliflower and broccoliBrassica oleracea var. botrytisBrassica oleracea var. capitataBrassica oleracea var. italicae1
- Treatment
- polyhedrosis epidemice0
- Interactor
- cabbage looperTrichoplusia nie0pest
- Outcome
- cabbage looper populatione0
- Direction
- reducee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In all of the four field experiments it was possible to initiate a polyhedrosis epidemic and thereby greatly reduce the cabbage looper population in such test plots”
e1“Field tests on cabbage, cauliflower and broccoli”
Claim · model-written summary
Increasing virus dosage accelerated disease progress.
- Taxon
- cabbage, cauliflower and broccoliBrassica oleracea var. botrytisBrassica oleracea var. capitataBrassica oleracea var. italicae1
- Treatment
- increased dosagee0
- Outcome
- disease progresse0
- Direction
- more rapide0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increased dosage caused more rapid disease progress”
e1“Field tests on cabbage, cauliflower and broccoli”
Claim · model-written summary
A 0.94 larva per acre dose initiated a polyhedrosis epidemic.
- Taxon
- cabbage, cauliflower and broccoliBrassica oleracea var. botrytisBrassica oleracea var. capitataBrassica oleracea var. italicae1
- Treatment
- a dosage of 0.94 larva per acree0
- Outcome
- polyhedrosis epidemice0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a dosage of 0.94 larva per acre initiated a polyhedrosis epidemic”
e1“Field tests on cabbage, cauliflower and broccoli”
Claim · model-written summary
Six months of frozen storage caused no apparent reduction in inoculum pathogenicity.
- Taxon
- cabbage, cauliflower and broccoliBrassica oleracea var. botrytisBrassica oleracea var. capitataBrassica oleracea var. italicae1
- Treatment
- Six months storage of the inoculum at 0° F.e0
- Outcome
- pathogenicitye0
- Direction
- did not cause any apparent reductione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Six months storage of the inoculum at 0° F. did not cause any apparent reduction in pathogenicity”
e1“Field tests on cabbage, cauliflower and broccoli”
Claim · model-written summary
Adding TEPP to the inoculum had no noted adverse effect.
- Taxon
- cabbage, cauliflower and broccoliBrassica oleracea var. botrytisBrassica oleracea var. capitataBrassica oleracea var. italicae1
- Treatment
- TEPPe0
- Outcome
- adverse effecte0
- Direction
- nor was there anye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“nor was there any adverse effect noted when TEPP or spreader-sticker (Rohm & Haas B-1956) was added to the inoculum”
e1“Field tests on cabbage, cauliflower and broccoli”
Claim · model-written summary
Adding spreader-sticker to the inoculum had no noted adverse effect.
- Taxon
- cabbage, cauliflower and broccoliBrassica oleracea var. botrytisBrassica oleracea var. capitataBrassica oleracea var. italicae1
- Treatment
- spreader-sticker (Rohm & Haas B-1956)e0
- Outcome
- adverse effecte0
- Direction
- nor was there anye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“nor was there any adverse effect noted when TEPP or spreader-sticker (Rohm & Haas B-1956) was added to the inoculum”
e1“Field tests on cabbage, cauliflower and broccoli”
The same questions in other papers
storage · disease · Brassica oleracea (wild cabbage)Positive and negative results
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See all 31 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.