Effectiveness of local biopesticides in the control of Diamondback Moth (Plutella xylostella L.) in cabbage production in Zanzibar, Tanzania | Učinkovitost lokalnih biopesticidov za uravnavanje kapusne sovke (Plutella xylostella L.) pri gojenju zelja v Zanzibarju, Tanzanija

English. This experiment was conducted to determine the effectiveness of different types of local biopesticides to control diamondback moth (DBM) in cabbage production in Zanzibar. The experiment was conducted in horticulture farms at Zanzibar Agricultural Research Institute. The experiment was conducted in a randomized complete block design, with 6 treatments and a control, each of which was replicated 3 times. The following plants were used as biopesticide which are garlic (T1), hot pepper (chilli) (T2), clove (T3), mixture of garlic and pepper (T4), mixture of garlic and clove (T5), synthetic insecticide (T6) and a control (T0). The parameters were evaluated by conducting initial data collection (before treatment) and final data collection (after treatment). The average number of leaves affected by DBM and yield in terms of average mass (kg) of cabbage were recorded. Results showed that T6 was significantly associated with a lowest average number of affected leaves and higher yield followed by T4 and T5. Overall, garlic-treated plots had recorded higher yield compared to the non-garlic treated plots. Therefore, garlic extract as local biopesticide can effectively repel DBM. This study recommends that garlic can be used as an alternative to using synthetic chemicals to control DBM in cabbage crop.

Slovenian. Poskus je bil izveden za določitev učinkovitosti različnih lokalnih biopesticidov za nadzor kapusne sovke pri gojenju zelja v Zanzibarju. Poskus je potekal na vrtnarskih kmetijah v Zanzibarju, na Zanzibar Agricultural Research Institute. Poskus je bil izpeljan kot popolni naključni bločni poskus s šestimi obravnavanji v treh ponovitvah in kontrolo. Obravnavanja so bila sledeča: česen (T1), čili (T2), klinčki (T3), mešanica česna in paprike (T4), mešanica česna in klinčkov (T5), sintetični insekticid (T6) in kontrola (T0). Obravnavanja so bila ovrednotena z zbiranjem podatkov pred in po obravnavanjih. Pridobljeni podatki so obsegali število po sovki napadenih listov in pridelek zelja, izražen kot poprečna masa zelja (kg). Rezultati so pokazali, da je imelo obravnavanje T6 značilno najmanjše število napadenih listov in večji pridelek, temu sta sledili obravnavanji T4 in T5. Nasplošno je bil pridelk na ploskvah, kjer so sovko zatirali s česnom večji, v primerjavi s ploskvami brez česna. Iz tega lahko sklepamo, da bi lahko bili izvlečki česna uporabljeni kot učinkovit lokalni biopesticid za zatiranje kapusne sovke. Izsledki raziskave kažejo, da bi lahko uporabili česen kot alternativo sintetičnim kemičnim pripravkom za uravnavanje zeljne sovke pri pridelavi zelja.