Manuka essential oil and its constituents were phytotoxic to cabbage, soybean and corn.

botanical · crop injury · Glycine max (soybean)Positive and negative results

2 papers in the same direction as this claim · 2 in the opposite direction

1. positive
   Cucumber extract detoxified paraquat phytotoxicity to soybean leaf.

   Aqueous Fraction of Cucumber Plant Extract Detoxifies Paraquat Phytotoxicity as a Superoxide Scavenger · 2016

   Opposite direction

2. positive
   Dry tissue aqueous extract of soybean had significantly higher phytotoxic potency than fresh tissue aqueous extract.

   Secale cereale L. suppression by aqueous extracts of Glycine max · 2012 · compared with fresh tissue aqueous extract

   Opposite direction

3. negative
   Six percent cashew extract caused phytotoxic symptoms on soybean leaves.

   Bioactive compounds and their their antifeedant activity in the cashew nut (Anacardium occidentale L.) shell extract against Bemisia tabaci, (Gennadius, 1889) (Hemiptera:Aleyrodidae) · 2019

   Same direction

4. negative
   Adding dry powder intensified the chemical seed treatment phytotoxic effects.

   Interaction of Mechanical Damage and Chemical Treatment and Its Effects on Soybean Seed Physiological Quality · 2022

   Same direction

botanical · crop injury · Zea mays (maize)Positive and negative results

6 papers in the same direction as this claim · 3 in the opposite direction

1. positive
   Untreated maize had more field leaf injury than insecticide and botanical treated maize.

   The Efficacy of Selected Synthetic Insecticides and Botanicals against Fall Armyworm, Spodoptera frugiperda, in Maize · 2019 · compared with non-treated control plants

   Opposite direction

2. positive
   Squash fourth-leaf water extract reduced paraquat phytotoxicity in maize compared with paraquat alone.

   Isolation, Identification and Characterization of Paraquat Activity-Inhibiting Substances in Squash (Cucurbita moschata Duchesne ex Poiret) Leaves · 2012 · compared with paraquat application alone

   Opposite direction

3. positive
   Neem extract substantially reduced leaf injury on maize compared with the untreated control.

   Evaluating the Efficacy of Neem (Azadirachta indica) and Chili (Capsicum spp.) Extracts for the Control of Fall Armyworm (Spodoptera frugiperda) in Maize (Zea mays) Production in Zambia · 2026 · compared with untreated control

   Opposite direction

4. negative
   In maize, dry aqueous extracts of sunflower were more phytotoxic than fresh aqueous extracts.

   ALLELOPATHIC EFFECTS OF AQUEOUS EXTRACTS OF SUNFLOWER ON WHEAT (TRITICUM AESTIVUM L.) AND MAIZE (ZEA MAYS L.) · 2014 · compared with fresh aqueous extracts (FAE)

   Same direction

5. negative
   L. sidoides oil at 0.75-3% was phytotoxic to maize.

   Fungistatic activity of essential oils for the control of bipolaris leaf spot in maize · 2019

   Same direction

6. negative
   Higher-concentration germinated-grain extract injured root tips and caused cortex cell hypertrophy.

   Effect of Extracts from the Corn Plant on Growth of Excised Root Tips · 1937

   Same direction

7. negative
   In vivo, the extract showed higher phytotoxic activity against maize (Zea mays).

   Selectivity of the bioherbicidal potential of Artemisia arborescens L. among model and agronomic crops and implications for pre- and post-emergence applications · 2023

   Same direction

8. negative
   The 10% pequi extract concentration showed phytotoxicity in corn after the second spraying.

   Aqueous extract of pequi fruit to control Spodoptera frugiperda in corn · 2018

   Same direction

1 paper more in this group

botanical · crop injury · Brassica oleracea (wild cabbage)Positive and negative results

5 papers in the same direction as this claim · 6 in the opposite direction

1. positive
   Neem oil reduced leaf injury to score 2.5 versus 3.6 untreated.

   Effect of some biorational insecticides on Spodoptera eridania in organic cabbage · 2008 · compared with untreated plots

   Opposite direction

2. positive
   No extract treatment showed phytotoxic effects on cabbage.

   Field efficacy of plant extracts on larval populations of Plutella xylostella L. and Helicoverpa armigera Hub. and their impact on cabbage infestation. · 2009

   Opposite direction

3. positive
   No extract treatment caused observed phytotoxic effects in cabbage.

   Efficacy of plant extracts for reducing larval populations of the diamondback moth, Plutella xylostella L.(Lepidoptera: Yponomeutidae) and cabbage webworm, Crocidolomia binotalis Zeller(Lepidoptera: Pyralidae), and evaluation of cabbage damage. · 2001

   Opposite direction

4. positive
   Broccoli treated with 0.1% extract mixtures showed no phytotoxic effect.

   KETAHANAN DAN PENGARUH FITOTOKSIK CAMPURAN EKSTRAK PIPER RETROFRACTUM DAN ANNONA SQUAMOSA PADA PENGUJIAN SEMI LAPANGAN · 2007

   Opposite direction

5. positive
   WP formulation caused no phytotoxicity on broccoli leaves.

   SAFETY AND EFFECTIVENESS OF MIXED PLANT EXTRACTS FORMULATION AGAINST CABBAGES PESTS UNDER FIELD CONDITIONS · 2017

   Opposite direction

6. positive
   Other essential oil formulations produced no broccoli phytotoxicity.

   Evaluation of the Insecticidal Efficacy of Acorus calamus (L.), Leptospermum petersonii FM. Bailey, and other essential oil formulations on Plutella xylostella (L.) · 2012

   Opposite direction

7. negative
   Extracts were phytotoxic above 10% dilution in the tested plant seeds.

   Glucosinolate-extracts from residues of conventional and organic cultivated broccoli leaves (Brassica oleracea var. italica) as potential industrially-scalable efficient biopesticides against fungi, oomycetes and plant parasitic nematodes · 2023

   Same direction

8. negative
   WP at 2-leaf stage caused greater injury than at 6–8 leaf stage.

   Evaluation of Oxyfluorfen Formulations for Cabbage Weed Control · 1984 · compared with plants treated at the 6–8 leaf stage

   Same direction

3 papers more in this group